Ubuntu installation

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## Contents

* 1 Ubuntu
* 1.1 Identify your machine and system
* 2 Installation documentation
* 3 Upgrading Ubuntu 22.04 LTS to 24.04.01 LTS (Noble Numbat)
* 4 Upgrading Ubuntu 18.04 to 20.04x to 22.04 LTS
* 5 Upgrading Ubuntu 16.04 to 18.04 LTS
* 5.1 Upgrading a desktop
* 6 Upgrading Ubuntu 14.04 to 16.04 LTS
* 6.1 Upgrading a DELL Precision tower
* 7 Ubuntu upgrades
* 7.1 Which version do I run
* 7.2 Minor upgrades
* 7.3 Hash Sum mismatch issues
* 7.4 Major upgrades
* 7.5 PHP/MySQL trouble with a 10.04 to 12.04 upgrade
* 8 System is broken
* 9 Networking, file systems and users
* 9.1 Defining a fixed IP number
* 9.2 Mounting external NFS partitions
* 9.3 Exporting partitions with NFS
* 9.4 Creating groups
* 9.5 Creating users
* 9.6 Using Samba
* 9.7 SFTP demon
* 9.8 Copying files from the old machine
* 10 Keyboards
* 10.1 For Logitech Devices
* 11 Displays
* 11.1 Installation of Nvidia Drivers
* 12 Legacy display stuff to sort out some day
* 12.1 Principles
* 12.2 High resolution monitors for Ubuntu 16.x and sound
* 12.3 Nvidia legacy notes- probably ignore
* 12.4 Adjust to high resolution screen in Ubuntu 16
* 12.5 Adjust to high resolution screen in Ubuntu 18
* 12.6 Lock Screen
* 12.7 Trouble
* 12.8 Configuration
* 12.9 Ubuntu Nvidia Quadro FX + 2 digital monitors
* 12.10 Displaying remote programs with X11
* 13 Install fonts
* 14 Sounds / Bell / beep
* 15 Desktop
* 15.1 Change window control buttons
* 16 Hot keys for the brave
* 17 Packages
* 17.1 Installing packages from a package archive
* 17.2 Installing deb files
* 17.3 Information about packages
* 17.4 Holding packages
* 17.5 Boot files
* 18 Other types of software packages
* 18.1 Appimages
* 19 Printers
* 19.1 Example Infotec
* 19.2 Different Ubuntu user name ?
* 20 X Windows
* 21 Java
* 21.1 Java 11
* 21.2 Java 8
* 21.3 Managing several version
* 21.4 Java in Firefox
* 22 Sound and music
* 22.1 Music services
* 22.2 Crackling sound in Ubuntu 18
* 22.3 Tips of older Ubuntus
* 22.4 Give permission to insecure web sites
* 23 Application hints
* 23.1 Rhythmbox
* 23.2 Who else has Linux nearby ?
* 24 Non-standard software
* 24.1 Dropbox
* 24.2 Screenshots
* 24.3 Shotcut
* 24.4 Mendeley
* 24.5 Skype
* 24.6 Google Chrome
* 25 Security
* 26 Opinions and alternatives
* 26.1 DKS
* 26.2 Alternatives
* 27 Links

## Ubuntu[edit | edit source]

Ubuntu is a popular Linux distribution, best suited for desktop computers. It is based on Debian, therefore the packaging (*.deb) works rather well.

Disclaimers

* This page so far is by no means a configuration and installation guide, but it contains some information that could be of use to some people. Daniel K. Schneider decided to put some of his installation notes in this wiki, so he won't loose them.
* I am be no means a systems expert. As you can see from other entries in this wiki I deal with lots of stuff and lots of it I don't really master ...
* Feel encouraged to add stuff :)

### Identify your machine and system[edit | edit source]

Find out what distribution you already have:

more /etc/issue
uname -a

Find the serial number for your machine (e.g. a Dell service tag)

sudo dmidecode -s system-serial-number

However, this may not work. E.g. on my new Dell Precision tower, this fails (as of June 2017)

## Installation documentation[edit | edit source]

Start with the official Ubuntu site (sometimes a bit lengthy):

* official installation guides

Sometimes it is useful to hunt down short installation documentation on other sites than Ubuntu. If you are looking for an other practical, short and excellent installation guides (and that may include how to add non-free software):

* future desktop
* UbuntuGuide.org (last LTS version)
* Ubuntuguide.org (guides for most recent version)

After installing (Thanx a lot to you guys, the articles below really did help me to get a somewhat decent working environment - Daniel K. Schneider 22:06, 20 September 2012 (CEST))

* Top things to do after installing Ubuntu 12.04 and 12.10 Quantal Quetzal

* Important Tweaks/Things to do After install of Ubuntu 12.04 Precise Pangolin

* To Do List After installing Ubuntu 12.04.1 LTS aka Precise Pangolin

## Upgrading Ubuntu 22.04 LTS to 24.04.01 LTS (Noble Numbat)[edit | edit source]

Firstly upgrade current version

sudo apt update
sudo apt upgrade

Then do it

sudo do-release-upgrade

Did in Jan 2025. Worked well as far as I can tell so far. Thunderbird was migrated to snap (without any intervention needed).

## Upgrading Ubuntu 18.04 to 20.04x to 22.04 LTS[edit | edit source]

Firstly upgrade to the latest 18.04

sudo apt update
sudo apt upgrade

Then do it

sudo do-release-upgrade

I did the 20.04 LTS upgrade on June 3 2021 and it worked without any extra work, including my double screen configuration. Maybe because I got an older PC, but I am still happy :) The whole procedure took about 90 minutes where I had to answer a few questions, using the default answer.

lsb_release -a

LSB Version:	core-11.1.0ubuntu2-noarch:security-11.1.0ubuntu2-noarch
Distributor ID:	Ubuntu
Description:	Ubuntu 20.04.2 LTS
Release:	20.04
Codename:	focal

In 2023 I upgraded from 20.04 to LTS 22.04 without problems.

LSB Version:	security-11.1.0ubuntu4-noarch
Distributor ID:	Ubuntu
Description:	Ubuntu 22.04.3 LTS
Release:	22.04
Codename:	jammy

## Upgrading Ubuntu 16.04 to 18.04 LTS[edit | edit source]

For major update, I strongly suggest waiting until the official update path is cleared, i.e. wait until `sudo do-release-update` works. I once forced the install and it miserably failed. So I had to install a new system and that went well (I only to change my uid/gid and mount server partitions again and, of course, reinstall all the software, but that was extra work ....)

Firstly upgrade to the latest 16.04

sudo apt update
sudo apt upgrade
sudo apt dist-upgrade
sudo apt autoremove

Early adopters:

sudo do-release-upgrade -d

else

sudo do-release-upgrade

### Upgrading a desktop[edit | edit source]

I tried before the official upgrade and it broke the system (the same as described for version 16.x below)

The process broke in the middle since some dependencies were not met.... For now I don't know if this can be fixed.

sudo apt install -f
Reading package lists...
Building dependency tree...
Reading state information...
Correcting dependencies... failed.
The following packages have unmet dependencies:
glib-networking : Depends: libglib2.0-0 (>= 2.55.0) but 2.48.2-0ubuntu1 is installed
glib-networking-services : Depends: libglib2.0-0 (>= 2.55.0) but 2.48.2-0ubuntu1 is installed
gnupg : Depends: gnupg-l10n (= 2.2.4-1ubuntu1.1) but it is not installed
Depends: gnupg-utils (= 2.2.4-1ubuntu1.1)
Depends: gpg (= 2.2.4-1ubuntu1.1)
Depends: gpg-wks-client (= 2.2.4-1ubuntu1.1)
Depends: gpg-wks-server (= 2.2.4-1ubuntu1.1)
Depends: gpgsm (= 2.2.4-1ubuntu1.1)
Depends: gpgv (= 2.2.4-1ubuntu1.1)
Breaks: python3-apt (<= 1.1.0~beta4) but 1.1.0~beta1ubuntu0.16.04.1 is installed
Breaks: software-properties-common (<= 0.96.24.3) but 0.96.20.7 is installed
libc6-dbg : Depends: libc6 (= 2.23-0ubuntu10) but 2.27-3ubuntu1 is installed
libc6-i386 : Depends: libc6 (= 2.23-0ubuntu10) but 2.27-3ubuntu1 is installed
libgail-3-0 : Depends: libglib2.0-0 (>= 2.49.4) but 2.48.2-0ubuntu1 is installed
libglib2.0-bin : Depends: libglib2.0-0 (= 2.56.1-2ubuntu1) but 2.48.2-0ubuntu1 is installed
libgoa-1.0-0b : Depends: libglib2.0-0 (>= 2.52) but 2.48.2-0ubuntu1 is installed
libgoa-backend-1.0-1 : Depends: libglib2.0-0 (>= 2.52) but 2.48.2-0ubuntu1 is installed
libgtk-3-0 : Depends: libglib2.0-0 (>= 2.55.2) but 2.48.2-0ubuntu1 is installed
python-apt : Depends: libapt-inst2.0 (>= 1.4~beta3) but 1.2.26 is installed
Depends: libapt-pkg5.0 (>= 1.4~beta3) but 1.2.26 is installed
python3 : PreDepends: python3-minimal (= 3.5.1-3) but 3.6.5-3 is installed
Depends: libpython3-stdlib (= 3.5.1-3) but 3.6.5-3 is installed
python3-minimal : Depends: python3.6-minimal (>= 3.6.5-2~) but it is not installed
python3.6 : Depends: python3.6-minimal (= 3.6.5-3) but it is not installed

Probably I first should try removing packages installed from a PPA, e.g. Inkscape.

https://askubuntu.com/questions/307/how-can-ppas-be-removed

Anyhow, I just killed the machine and installed a new 18 version. Reinstalling can be justified if you need several new software, e.g. Inkscape and do not want to upgrade these via an external PPA. Before you do so, backup your home and maybe some other configuration files.

## Upgrading Ubuntu 14.04 to 16.04 LTS[edit | edit source]

This upgrade was available since July 21 2016 (16.04.1 LTS)

Upgrade to latest 14.04 (not sure that this is really needed)

sudo apt-get update
sudo apt-get dist-upgrade
sudo apt-get autoremove

Upgrade to 16.04 LTS

sudo do-release-upgrade

If this doesn't work, try

sudo update-manager -d

### Upgrading a DELL Precision tower[edit | edit source]

Even in April 2017, a high end DELL desktop workstation comes with Ubuntu 14LTS (pre-installed). I got a 5810 tower with a Xeon E5-1620 v3 (Four Core HT, 10MB Cache, 3.5GHz Turbo, a 500GB SSD and a NVIDIA® Quadro® M4000 8Go graphics card. That system does not want to upgrade, or at least mine would not.

* Ubuntu certification is 14.04 LTS 64-bit

Symptoms:

* Doing the steps above broke the GUI (Can't log in anymore). This is not related to upgrading to 16LTS but still a big hassle (see below)
* From a terminal (hit CTL-ALT-F1), the do-release-upgrade command won't find any upgrades. It says:

No new release found

Someone (at DELL) decided that you should not update, so `iff` you believe that you should upgrade, then change this setting even before any upgrading / updating to newer 14LTS packages.

* Edit `/etc/update-manager/release-upgrades` and set Prompt=lts

If your system is new (like mine), you could use the Nano editor, e.g. type:

sudo nano /etc/update-manager/release-upgrades

Now

sudo do-release-upgrade

This went pretty well, except that the the GUI was still broken. Nvidia drivers are proprietary and even if you install new ones from the graphics repository (see below), I could not login.

To fix that:

* Disable secure boot (sorry I was too fed up to take notes, but), the most important part is;
* run a terminal: CTL-ALT-F1, then type:

sudo update-secureboot-policy

* Then enter a password you can remember, e.g. yours, and then immediately reboot. It will then ask you to enter the password you just gave in a weird way, character by character.

Now I could log into the system, but the there was no desktop (i.e. compiz was broken). There was only the graphics layer. With that you can still open open a terminal (right click) but it cannot be moved since compiz did not work. In order to get the control center, you could type in terminal:

unity-control-center --overview

... but there is nothing in there that would fixing the problem. However, you can create a new user (see below)

Solution: Kill yourself and get a new better self. Do do so:

* Create a new user with root privileges, e.g. call it admin (and so make sure that he/she got these privileges !!)
* Kill your user
* Create a new one. Also consider getting good uid and gid values, e.g. the same that you would have on other machines in your network.

Comment:

* This is not the first time I have trouble installing or upgrading a Linux desktop. Windows is so much easier. However once Ubuntu is up and running I feel more comfortable with it.
* On the positive side, this DELL machine does seem to be fast, e.g. will load 3.5 Mio Meshes into Meshlab really fast. It even can play games through Steam. It also is very silent.

## Ubuntu upgrades[edit | edit source]

### Which version do I run[edit | edit source]

Type:

lsb_release -a

### Minor upgrades[edit | edit source]

From the command line, to update the repository information:

sudo apt-get update

To upgrade

sudo apt-get dist-upgrade

will do the upgrade fairly smartly (make sure that all dependencies work)

sudo apt-get dist-upgrade

will upgrade the existing packages to the latest version

### Hash Sum mismatch issues[edit | edit source]

If something like GPG error: http://mirror.switch.ch hardy-updates Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com> happens, you might change the server. Either,

* Edit /etc/apt/sources.list

* change with menu System->Administration->Software sources

Or get a new key (2) Identify the missing ones

sudo apt-get update
sudo apt-key adv --recv-key --keyserver keyserver.ubuntu.com XXXXXXXXXX

XXXXXXXXX is the missing key.

### Major upgrades[edit | edit source]

* You can upgrade from LTS to LTS (however that takes a little bit of waiting, e.g. 12.04 LTS will upgrade to 14.04.01
* Upgrade first the existing installation
* Clean repository information. I.e. remove those that don't work anymore (read this (command-line) or that (details, search for "removing").

apt-get dist-upgrade

To upgrade

do-release-upgrade -d

### PHP/MySQL trouble with a 10.04 to 12.04 upgrade[edit | edit source]

* Read this and similar. It helped. I had to force remove remove everything mysql before I could install a 5.5 version + all the other things that were remove (like php-mysql).

* PHP can't find some extensions. Install these again, e.g.

apt-get install php5-gd php5-mcrypt php5-suhosin

## System is broken[edit | edit source]

You can create a bootable USB stick with an Ubuntu installer

Once you are in the system, you can bind the old the system like this:

* Firstly find out where the ubuntu sits (e.g. in /media), then mount its four directories like this:

sudo mount --bind /dev /media/ubuntu/15*/dev
sudo mount --bind /proc /media/ubuntu/15*/proc
sudo mount --bind /sys /media/ubuntu/15*/sys
sudo mount --bind /run /media/ubuntu/15*/run

The you can change into the old system and do things, e.g. replace the graphics driver, remove sssd or whatever.

sudo chroot /media/ubuntu/15*

* To unmount

exit

for dir in /run /sys /proc /dev/pts /dev; do umount /media/15*/$dir; done

## Networking, file systems and users[edit | edit source]

### Defining a fixed IP number[edit | edit source]

By default, a workstation will use numbers from DHCP and that should work without problems.

Alternatively, you also can, in some institutions, that DHCP always provides you with a fixed address. Ask. This solution works in our institution.

Finally, if you want to add manually a or several fixed IP numbers.

* Get one from your computer services
* Read Network Configuration

More simply, on a workstation, use the "Network" tool in the `System settings`. Click on Options, then the various tabs ...

### Mounting external NFS partitions[edit | edit source]

Read more about this topic:

* Setting Up NFS How To (Ubuntu Community Help Wiki)
* Introduction to Fstab (Ubuntu Community Help Wiki)

Installing mnt and mount points

It's a bad idea to keep your files on your personal PC. Since we have sun servers with daily backup I just mount partitions via NFS. NFS may not be included in your install

apt-get install nfs-common

mkdir /mnt/YYY

then edit /etc/fstab and enter line(s) like this

XXX.unige.ch:/export/home /mnt/YYY nfs defaults 0 0

Then mount these

mount -a

Changing your user id to make it compatible with the one that sits on the server

* If you installed from the standard distribution, your user is is not compatible with the one you have on an other machine, so you have to change it. You can use the user management tool in the System menu (click on "unlock").
* Create a new group first and use the gid from your server (type id- a on the server machine), e.g. to create a group "stars" with gid 6001:

groupadd -g 6001 stars

* To change your user id is more tricky, can't do this while you are in the desktop. An easy method is to use the usermod tool (after logging out from the GUI and login in with another user !!), e.g.to change user dks to uid=6000

usermod -u 6001 dks

or if you want to change the uid too:

usermod -g 6000 -u 6001 dks

Firewall

If the mount -a doesn't work there could be a firewall problem. You will have to open NFS communication channels. On the server machine, check the 2049 port.

grep nfs /etc/services

... might tell you what ports nfs needs, e.g.

nfs		2049/tcp			# Network File System
nfs		2049/udp			# Network File System

Now check if these ports are open

sudo ufw status

Change if necessary on the server machine (see below for more details)

ufw allow from your_client_ip to any port 2049 proto udp
ufw allow from your_client_ip to any port 2049 proto tcp
sudo ufw reload

replace your_client_ip by the ip (or domain) of your client machine

### Exporting partitions with NFS[edit | edit source]

Become root, or add "sudo" in front of all commands ...

Either NFS or Samba allow to share a partition with other (client) machines. In order to use NFS:

1) Install NFS on your server machine

apt-get install nfs-kernel-server

2) Configure the directories to be exported by adding them to the /etc/exports file. For example:

/export/data mymachine.yourorg.org(rw,sync,no_subtree_check)

will export the directory /export/data/ for the host (computer) mymachine.yourorg.org with (with-permissions). Do not use something like:

/export/data *(rw,sync,no_root_squash)

I.e. only give specific machines access to your partition and do not let your client machine be root.

2b) If your client machine (e.g. a personal Linux computer) is not in the DNS, then you can either provide an Internet number or define your machine in the /etc/hosts file, e.g.

129.xx.y.z  mymachine

Then in the /etc/exports use something like

/data mymachine(rw,sync,no_subtree_check)

/data mymachine(rw,sync,no_subtree_check) mylaptop(rw,sync,no_subtree_check)

/web 192.0.2.1(rw,sync,no_subtree_check)

After doing so, type in the shell

exportfs -a

And check:

exportfs

3) Mount the exported directory on your client machines, as already explained above. Firstly make sure that nfs-common is installed.

apt-get install nfs-common

* Create an empty directory, e.g.

mkdir /mnt/data

* Edit file /etc/fstab on your client machine

servermachine.x.y:/export/data /mnt/data nfs defaults 0 0

* Then type on your client machine:

mount -a (on your machine)

If it doesn't work, look at the log files of the server machine. Most likely you failed to give permission. Also, you should restart the NFS daemon on the server. Type:

/etc/init.d/nfs-kernel-server restart

4) User id and group ids

If you want to write files in the server, then user and group id's must match on both machines....

### Creating groups[edit | edit source]

To create an ordinary group of users:

groupadd -g GID_number group_name

e.g.

sudo groupadd  -g 1200 toto

### Creating users[edit | edit source]

* On your desktop machine, you can use the system menus
* Unlock (top right) in the user accounts tool, then click on the +.
* On a server, you can use useradd. Make sure that user and group id's match those of other machines in case you plan to mount partitions (e.g. a web server directory on your desktop).

useradd -ggroup_name -uNNNNN -m -p XXXXX login_name

group_name = name of primary group
NNNNN = uid number, e.g. 160001
XXXXX = password
login_name = login + home directory name, e.g. dks

If you want to add the user to other groups, use the -G flag or use usermod. E.g.

usermod -Gadmin,adm dks
will add the user dks to the adm and the admin group.

A simpler way to make someone admin, is to use the GUI (User Accounts tool in the System tools)

id -a [login]
will display an id of a user

### Using Samba[edit | edit source]

* http://praxis.edoceo.com/howto/samba4
* Samba4 (Samba wiki). RC as of nov 2012

List verbously all users

* sudo pdbedit -L -v

Add a user (Samba V3)

* sudo smbpasswd -a sambausername
* Depending on your setup you also may have to give permission to use shares. Otherwise, we suggest using a kind of group permission in your /etc/samba/smb.conf file, e.g.

[data]
path = /pics
comment = Data
writeable = yes
valid users = @tourists
create mask = 0664
directory mask = 0775

### SFTP demon[edit | edit source]

sudo apt-get install openssh-server

Read: OpenSSH server

### Copying files from the old machine[edit | edit source]

Via scp

An easy way to copy files is to use the scp command which is installed by default.

Exemple - copy recursively a directory from old remote host to the current directory in new (local) machine. On your new, local machine, type something like:

cd ~/some
scp -r username@remote.host:/home/user/some/source_dir/ .

Via rsync

The rsync program allows to synchronize files between two machines and also can be used to copy and can be recommended to distracted people...

Make sure to include either a trailing slash in the destination folder or go there ! `dry-run` does what it implies and you should use it first.

Copy to remote (dry run)

sudo rsync --dry-run -azvv -e ssh /home/path/folder2/ remoteuser@remotehost.remotedomain:/home/path/folder2

Get a directory from remote

cd target
rsync -avzh user@remote.host:/home/user/source_dir .

Synchronise Music from remote without displaying (wait for a few minutes or hours)

rsync -azh schneide@129.194.30.22:/home/schneide/Music .

Via Tar and ssh

* Using tar archives is probably the fastest way, e.g. from the old machine do something like:

(cd /home/path && tar czf - . ) | ssh user@new.machine 'cd /home/path && tar xzf -'

## Keyboards[edit | edit source]

Can misbehave.

In case you got sticky keys: Press the accessibility icon on top menu bar and disable sticky keys. Same for slow keys. (See this)

If key mappings are wrong and you got a logitech keyboard, see below.

### For Logitech Devices[edit | edit source]

Did not work for me. Even the latest 1.18 version did not recognize the Logitech K280e on Ubuntu 22.04 LTS. This wasn't a real problem, since this keyboard works really well.

sudo apt install solaar
solaar

Hower, solaar may not be up-to-date in the official repository and your Logitech device may not be dectected. In that case, you can try downloading a newer version from the repository. For example

sudo add-apt-repository ppa:solaar-unifying/stable
sudo update
sudo apt upgrade solaar

## Displays[edit | edit source]

### Installation of Nvidia Drivers[edit | edit source]

Ubuntu drivers can horribly break your system. At least, it has happened to me more than once. So

* Install proprietary drivers from Nivida: https://www.nvidia.com/en-us/drivers/unix/
* Block the driver like this. Really make sure that Ubuntu cannot do anything !

sudo apt-mark hold nvidia-driver-570 \
libnvidia-gl-570 \
nvidia-kernel-common-570 \
linux-modules-nvidia-570-6.8.0-59-generic

Do not forget. To unlock:

sudo apt-mark unhold nvidia-driver-570 \
libnvidia-gl-570 \
nvidia-kernel-common-570 \
linux-modules-nvidia-570-6.8.0-59-generic

## Legacy display stuff to sort out some day[edit | edit source]

### Principles[edit | edit source]

Ubuntu 18 easily detects two high resolution monitors (probably under the condition that you did install the third party modules, i.e. an option when you install the system)

Most older Linux distribution's installers (at least the free ones) can't handle some slightly more fancy hardware automatically. Usually you have to do either of two things

1. Configure the drivers from the ubuntu desktop (if your are lucky) and then use nvidia-settings
2. Hand edit the /etc/X11/xorg.conf file to tweak things.

Also read:

* How to install Nvidia 295.40 drivers in ubuntu 12.04/11.10 using PPA
* Ubuntu Twinview Monitors with an NVidia Graphics Card (T. Fitzgerald/3/2007)

* Remember to save every version (preferably on an other machine or in a wiki) that worked.

### High resolution monitors for Ubuntu 16.x and sound[edit | edit source]

I got

* a DELL Precision T5810 with a Xeon E5-1620
* a Quadro M4000 graphics card with two monitors
* a DELL UP3216Q 32 (3840 X 2160) at 60Hz
* a DELL U2715H 27 (1440 X 2560), i.e. rotated vertically, at 59.95 Hz

The card has four DisplayPort (DP) slots and the (combined) X Screen 0 has 5280x2560 pixels (1397x677 millimeters)

Connecting a high resolution (as of 2017, i.e. 4K) and a half-high resolution monitor does work for both Ubuntu 16 LTS and 18 LTS.

Main trouble when connecting the monitor was that I did not push in the DP connector enough on display side and the system would not detect the monitor. Only after switching the cable I figured it out. Also when you close the "door" at the back of the screen, the DP can become loose again...

Using DP seems to affect sound output, i.e. after connecting a DP monitor sound will be gone ...

* Either install `pavucontrol` and use Line Out built-in Audio (the normal Sound controls will not detect this)
* Or connect the loudspeakers directly to the monitor. In that case they will be detected as HDMI/Display Output in both. The normal "Sound" settings also will see the speaker now (HDMI/DisplayPort/GM204 High Definition Audio Controller). That is the solution I adopted.

### Nvidia legacy notes- probably ignore[edit | edit source]

This is not required usually. Only do it iff you run into trouble.

Some documentation

* BinaryDriverHowto/Nvidia

Firstly, you should know what drivers you have got. In a terminal, type:

nvidia-smi

The should you see something like the following, i.e. driver version and card model.

Fri Apr 28 18:02:59 2017
+

--+
| NVIDIA-SMI 381.09                 Driver Version: 381.09                    |
|

-+

-+

-+
| GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
|===============================+======================+======================|
|   0  Quadro M4000        Off  | 0000:03:00.0      On |                  N/A |
| 46%   38C    P8    13W / 120W |    179MiB /  8111MiB |      0%      Default |
+

-+

-+

-+

Alternatively, try

nvidia-settings

If you don't see anything, then there is no driver installed (or you may not have an Nvidia card).

To install or replace a drive, make sure that your machine allows installiong 3rd party drivers.

If you cannot see or use the desktop:

CTRL-ALT F1: To get a terminal

Get rid of old nvidia drivers

sudo apt-get purge nvidia-*

Install the repository (if not already done so)

sudo add-apt-repository ppa:graphics-drivers/ppa
sudo apt-get update.

Figure out the name of the latest driver. There are several strategies:

* Google

sudo ubuntu-drivers devices

Install the latest driver

# sudo apt-get install nvidia-370 // Make sure to take the best driver you need. Best can be the latest, but not necessarily so...
sudo apt install nvidia-381

### Adjust to high resolution screen in Ubuntu 16[edit | edit source]

Setting default fonts of all application is difficult in Ubuntu. You may have to change several settings using several tools. After an upgrade, settings may revert (so keep a note of what you did). Read more here (Adapt Ubuntu to a high-DPI resolution screen)

In Ubuntu 16, you easily can tune the size of menu bars. In the system settings go "Displays" and set the "Scale for menu and title bars", e.g. to 1.38 for a 3840x2160 32 screen and 1.2 for a 2560x1140 27

unity-control-center display

Fixing menu bars will not fix application fonts. You could change "universal access" fonts, but the applications that do respect this (e.g. terminal, thunderbird, ryhthmbox already do adjust font pixels. If you want to try nevertheless, type:

unity-control-center universal-access

Seeing --> Large Text; Slide to On

Firefox:

about:config

set `layout.css.devPixelsPerPx` to a value between 1.2 and 1.5 (I use 1.3 but I got good glasses)

Thunderbird:

* Fonts are fine on the main screen but too big on the small 27 monitor that has a lower resolution
* Best solution: Install font-size-changer plugin

Java:

* Older Java applications are definitely the worst UI experience you can get. Not only you will have to cope with strange panel controls but also you won't be able to read anything. You can try Fix scaling of java-based applications for a high DPI screen who propose a python or a bash script to change resolution.

### Adjust to high resolution screen in Ubuntu 18[edit | edit source]

Install unity tweak tools.

Upgrade the system first !

Installing only the tweak tool did not work ( schema com.canonical.notify-osd no installed). As of July 2018, do the following:

sudo apt-get install notify-osd
sudo apt-get install --reinstall overlay-scrollbar
sudo apt install unity-tweak-tool

The launch it and set Overview -> Fonts, Text scaling factor.

Firefox and Thunderbird: Do as explained in the previous section (Ubuntu 16). That being said, after changing the params in Firefox then ones in Thunderbird did change too. Rather freaky.

### Lock Screen[edit | edit source]

You could set "turn off" and "sceen lock" through the standard GUI tool "Brightness and Lock". However, the max. amount you can input is 60 minutes for both.

to change in terminal to blacken after 1 hour and to lock after 2 hours:

gsettings set org.gnome.desktop.session idle-delay 3600
gsettings set org.gnome.desktop.screensaver lock-delay 7200

Check the settings:

gsettings get org.gnome.desktop.screensaver lock-delay
gsettings get org.gnome.desktop.screensaver idle-delay

### Trouble[edit | edit source]

Cannot not see the desktop

You could try to deinstalling the current driver and replace by a new one. See above.

As of April 2017, you will get strange window decorations, fuzzy around the edges. Workaround: Restart the window manager

compiz --replace

Solution (maybe). Download the latest driver (see above)

sudo apt install nvidia-381

This will ask again to confirm that secure boot is disabled

reboot

... and answer the funny questions

After installing

sudo apt-get autoremove

System cannot wakeup after a longer suspend,

* the screen remains black, using magic keys like CTL-ALT F4 won't work
* You may see an "entering Power save mode"

* Read this

Edit /etc/default/grub
Modify GRUB_CMDLINE_LINUX="" to GRUB_CMDLINE_LINUX="nouveau.modeset=0"
sudo update-grub

You also can try hitting the SHIFT key a lot and then press CTRL-ALT-F1 (log in again)

### Configuration[edit | edit source]

Search System settings, then Displays. Ubuntu should autodetect your monitors. You then can change resolution, rotation and position for each.

For more advanced settings, search CompizConfig in the Dashboard, or type ccsm. You may have to install it and if you have a double monitor configuration, you must install the extras

sudo apt-get install compizconfig-settings-manager compiz-plugins-extra
ccsm &

* Click on Window Management
* Tick "Put" (for double monitor)

In addition you could change the hot key for switching.

... Having to install an advanced configuration tool with advanced extras is totally ridiculous. Under Windows adding a second monitor is plug and play. Under Ubuntu this takes 1 hour ore more to figure out.

### Ubuntu Nvidia Quadro FX + 2 digital monitors[edit | edit source]

Recent Ubuntu editions handle Quadro cards quite well (iff and after you managed to install the system, see above). Just use the display tool in the systems settings.

In case you are interested in older versions of Ubuntu, see the wiki history of this article.

### Displaying remote programs with X11[edit | edit source]

According to this Stackexchange, If you are root on another machine and you get " X11 connection rejected because of wrong authentication." try the following (worked for me)

ssh remote_host -XY -luser
sudo su

xauth merge /home/user/.Xauthority

## Install fonts[edit | edit source]

Most fonts one can download are zipped

Install with the font manager

* extract the files
* Most fonts are either in TTF (true type font) or OTF (Open Type Font)
* In the file manager, double click on each file. In Ubuntu 16, fonts will be installed in the ~/.local/share/fonts directory. Since this can take time, see the next item.

Install by copying

* Put them into the ~/.local/share/fonts directory or the /.fonts directory

Install system wide

apt install fontconfig

* copy font files to /usr/local/share/fonts
* `sudo fc-cache -f -v`

## Sounds / Bell / beep[edit | edit source]

By default, Ubuntu disables the beep in terminals

To get it back (according to this)

* Run gconf-editor and if the desktop | gnome | peripherals | keyboard | bell_mode setting is present then change it from off to on.
* Add `pactl upload-sample /usr/share/sounds/gnome/default/alerts/glass.ogg bell.ogg` to the file ~/.xprofile
* Add `[ "$DISPLAY" ] && xset b 100` to the file ~/.bashrc

To get a bell in Emacs, read AlarmBell

## Desktop[edit | edit source]

### Change window control buttons[edit | edit source]

By default the window control buttons are to the left in Ubuntu 10.04 LTS - the Lucid Lynx - released in April 2010 (annoying for older people like me who don't want to retrain procedures for no good reason).

To fix this, i.e. move the control buttons to the right as before: Press ALT-F2 or open a terminal and type gconf-editor. Navigate to /apps/metacity/general and change the button_layout to :minimize,maximize,close (the : must be in front).

Of course, you also could specify :maximize,minimize,close ....

## Hot keys for the brave[edit | edit source]

So your GUI is stuck ....

To boot into recovery mode or another kernel

SHIFT

while the machine boots

To open a console terminal (no GUI), new login

CTRL-ALT F3 to CTRL-ALT F7

Warning: In Ubuntu 16 one could use CTRL-ALT F1 etc. but that does no longer work !!

Then you can for instance restart the Window manager:

sudo restart lightdm

To go back to the desktop (Ubuntu 16)

CTRL-ALT F7

To go back to the desktop (Ubuntu 16)

CTRL-ALT F2

To see boot system messages

CTRL-ALT F8

To restart the X server (your GUI)

CTRL-ALT BACKSPACE

## Packages[edit | edit source]

Basically, an end-user can do most of this stuff with a GUI tool, i.e. the synaptic package administrator. However it is good to know a few command line things for 2 reasons:

* You may have damaged your desktop when trying to install a new video driver
* It's sometimes faster. In particular when you see on some website that this and this package should be installed in this and that order ...

A list of command-line stuff (you must be root or add "sudo" in front of each). Sometimes there are equivalent commands for abt-get and aptitude. See the apt howto at Debian.

### Installing packages from a package archive[edit | edit source]

To fix the ubuntu archive mirrors

(if you can, you can also do this from the desktop package manager) Edit /etc/apt/sources.list

You should at least have:

deb http://archive.ubuntu.com/ubuntu/ hardy main universe multiverse restricted
deb http://archive.ubuntu.com/ubuntu/ hardy-updates main universe multiverse restricted

... but the it's better to use a nearby mirror, e.g. for Switzerland:

deb http://mirror.switch.ch/ftp/mirror/ubuntu/  (... same for the rest ...)

To check if there are any partially installed packages. It will try to complete these installations.

dpkg --configure -a

To find a package XXX

aptitude search XXX

Installing

apt-get install XXX

If this fails because of dependency issues, you then can try:

apt-get -f install

Cleaning and such

To detect and fix dependency problems

aptitude -f install

To remove packages from the local cache

apt-get clean

To update the package list

aptitude update

To reinstall a package XXX that seems to be broken

apt-get --reinstall install XXX

Upgrading

To upgrade conservatively

aptitude safe-upgrade

To upgrade with a an message showing packages

apt-get -u upgrade

To upgrade to a new release

apt-get -u dist-upgrade

Removing

To really remove package XXXX

apt-get --purge remove XXXX

If a package doesn't want to go (e.g. something went wrong during install, e.g. a decompression error and a crash in the middle of the install) and an installer (or you) wants it go, look for the package in /var/lib/dpkg/status and make it install ok installed Followed by:

apt-get remove --purge XXXX
apt-get update
apt-get dist-upgrade (or whatever you planned to install)

### Installing deb files[edit | edit source]

Sometimes, software is distributed as package for download, i.e. a *.deb file

To install it:

dpkg -i XXX.deb

If you run into dependency error messages you'll have to add packages (no problem) or remove packages (avoid !).

Example (for the eXe eLearning authoring system):

dpkg -i python2.5-exe_1.04.0.3532-ubuntu1_i386.deb

will give:

Unpacking python2.5-exe (from python2.5-exe_1.04.0.3532-ubuntu1_i386.deb) ...
dpkg: dependency problems prevent configuration of python2.5-exe:
python2.5-exe depends on python-zopeinterface (>= 3.0.0-6); however:
Package python-zopeinterface is not installed.
dpkg: error processing python2.5-exe (--install):
dependency problems - leaving unconfigured

First thing to do is to try something like:

apt-get install python-zopeinterface

### Information about packages[edit | edit source]

xxx is the package name or package file (*.deb) name

Getting information about a package

apt-cache search xxx

apt-cache showpkg xxx

apt-cache show xxx

To find a package on your system, if you know a file name

dpkg -S xxx_file_name

apt-file search filename

To list all packages and search for a name.

dpkg -l | grep xxx

To extract a deb file without really installing it

dpkg --unpack xxx.deb

To list the contents of a package file

dpkg -c xxx.deb

### Holding packages[edit | edit source]

In theory:

apt-make hold packagename

However, this doesn't seem to work as expected, i.e. Ubuntu will try to update dependencies of a package that you not want to upgrade. For exemple if your package uses and old Java, it will try to update it, although it is gone from the repository.

Edit file /var/lib/dpkg/status

* Remove unwanted old packages from `Dependencies:`

### Boot files[edit | edit source]

Identify the kernel you currently use:

uname -r

List all installed images:

dpkg -l linux-image-\* | grep ^ii

If the following does not work (e.g. because the file partition is full):

sudo apt-get purge linux-image-3.2.0-55

try:

sudo dpkg --purge linux-image-3.2.0-55-generic
... etc.

Then, in order to complete a previous failed installation:

sudo apt-get -f install

Finally, now clean a whole lot of other old ones, eg.

sudo apt-get purge linux-image-3.2.0-58 linux-image-3.2.0-59 linux-image-3.2.0-60 linux-image-3.2.0-61

And remove other stuff you don't need

sudo apt-get autoremove

## Other types of software packages[edit | edit source]

There exist several other distribution mechanisms, such as flatpack or appimages

### Appimages[edit | edit source]

App images contain all the libraries needed to run an application. It therefore should run on most Linux systems.

To use:

* Download
* Change permission to +x
* Run it

For better integration, read this. In short, install AppImageLauncher. If you click on an appimage in the filemanager, it will copy it to a specific directory and integrate it in the system, e.g. you can dock the application later.

sudo add-apt-repository ppa:appimagelauncher-team/stable
sudo apt update
sudo apt install appimagelauncher

This only will work with clean appimages. Those that are broken and need extra paramters do no seem to work. E.g. mendeley needs an extra --no-sandbox parameter.

./mendeley-reference-manager-2.84.0-beta.0-x86_64_cb2cce94615522bfd12079b8bad4cd8b.AppImage --no-sandbox &

## Printers[edit | edit source]

Printers don't necessarily work automatically either:

Before connecting a network printer, it is likely that you need a a PPD file (a file that defines properties of your postscript printer). Get it from:

* http://openprinting.org/printer_list.cgi

### Example Infotec[edit | edit source]

(this needs to be verified)

Example for Infotec ISC 1032 (A low end color copy and printer machine)

* Look at the entry:
* http://openprinting.org/show_printer.cgi?recnum=Infotec-ISC1032
* Get the PPD file (and copy it anywhere) ** http://openprinting.org/foomatic-db/db/source/PPD/Infotec/PS/Infotec-ISC1032_PS.ppd
* Then, start http://localhost:631/admin in your browser and when asked upload the PPD file
* Finally configure the printer (e.g. define paper size, trays and stuff).
* If CUPs printing doesn't work, use "HP JeDirect" and port 9100.

### Different Ubuntu user name ?[edit | edit source]

Read Use different username on CUPS remote printing

Summary (Quoted from above) According to the man page https://www.cups.org/doc/man-client.conf.html, a User directive could be placed in /etc/cups/client.conf or ~/.cups/client.conf

However, this didn't work for me in Kubuntu Trusty. What worked, was to export the CUPS_USER environment variable by adding the following line in ~/.profile:

export CUPS_USER=vangelis

## X Windows[edit | edit source]

We run a few sun servers and I prefer to run emacs (GUI) on a remote machine instead of mounting all these file systems. Also I prefer to have a root terminal open instead of typing 'sudo' all the time. If you want allow for this:

Reconfigure the window manager (gdm)

* Edit /etc/gdm/gdm.conf and change:

DisallowTCP=true

* Then, you'll need to restart your X session (Ctrl + Alt + Backspace)

Allow remote hosts to connect

* Then you can allow certain hosts to connect e.g. to allow root on your own machine type

xhost + localhost

* To allow somebody on a different machine, type:

xhost + xxx.yyy.zzz

* It's important not to to type 'xhost +'. Since anyone may then connect to your screen. However, type xhost + something is boring, so it's more practical to edit /etc/X0.hosts. Just put the names or IP numbers of authorized machines there.

If it doesn't work

You can install nmap to scan ports (X is on 6000).

* If you don't have nmap:

sudo apt-get install nmap

* Then type (as user):

nmap -v -A localhost

In some cases you may have to define the display of your machine on your client machine. On your client machine type something like:

export DISPLAY=xxx.yyy.zzz:0

setenv DISPLAY xxx.yyy.zzz:0

Or more practical, log into the the client machine like this:

ssh -XY

## Java[edit | edit source]

By default Ubuntu comes with some Java compatible version that is free. For some applications though, you need Java 7 or 8 from Oracle (Java formerly was made by Sun)

### Java 11[edit | edit source]

(tested with Ubuntu 18 LTS)

There are several repositories from which you can get an installer. Alternatively, you could Java from Oracle and install it manually.

Read this:

* https://www.digitalocean.com/community/tutorials/how-to-install-java-with-apt-on-ubuntu-18-04
* https://thishosting.rocks/install-java-ubuntu/

sudo apt update
sudo apt upgrade

.....

### Java 8[edit | edit source]

(tested with Ubuntu 14.x LTS)

Read this:

* http://www.webupd8.org/2012/09/install-oracle-java-8-in-ubuntu-via-ppa.html

Install it:

sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java8-installer

Test it:

java -version

You should see something like

java version "1.8.0_77"
Java(TM) SE Runtime Environment (build 1.8.0_77-b03)
Java HotSpot(TM) 64-Bit Server VM (build 25.77-b03, mixed mode)

### Managing several version[edit | edit source]

Several java version can be managed through script, but at the system level there is a simpler solution

sudo update-alternatives --config java

### Java in Firefox[edit | edit source]

Installing Java does not install a plugin in Firefox. Java is needed for many institutional applications and in addition there are many interesting applets for education. So let's go. Make sure that Java is installed on your machine (e.g. see above for Oracle Java).

For old Firefox version

The following will not work with a recent Firefox )> 53 I believe)

Install a a Firefox plugin that should enable a currently installed Open Java (did not work for me)

sudo apt-get install icedtea-plugin

Create a symbolic link to the Oracle plugin from the Firefox plugin directory (did not work for me)

cd /usr/lib/firefox-addons/plugins
ln -s /usr/lib/jvm/java-8-oracle/jre/lib/amd64/libnpjp2.so

Install the Firefox ESR version (this works)

It seems that the only way to have Java under Linux is to install an old version of Firefox. The "ESR" version was made for just this purpose.

* Download firefox ESR
* Unpack the bz file somwhere, e.g. in  ~/bin/firefox
tar xjvf firefox-52.2.0esr.tar.bz2
mv firefox ~/bin/

Then launch it like so:

~/bin/firefox/firefox --new-instance -P ESR

this is important I believe. You should not mess with your default profile that you use with your regular new version of firefox. This version is just for messing with Java applets.

## Sound and music[edit | edit source]

Since Ubuntu 16LTS, sound works rather well. The only problem is figure out how to hook up the external speakers (see the display section for that)

### Music services[edit | edit source]

Music services through the browser may not work (google for solution).

E.g. to use Amazon cloud music, read this

Nuvola is available through flatpak, a kind of app distributor that works across various OSs.

sudo apt-get install flatpak xdg-desktop-portal-gtk gnome-software-plugin-flatpak
flatpak remote-add --if-not-exists flathub https://dl.flathub.org/repo/flathub.flatpakrepo
flatpak remote-add --if-not-exists nuvola https://dl.tiliado.eu/flatpak/nuvola.flatpakrepo
flatpak update
flatpak install nuvola eu.tiliado.Nuvola

The launch flatpak and find the nuvola amazon cloud player. Click on install.

This worked for me (Ubuntu 18, using Amazon France from my workplace in Switzerland). Listening to Lazy Bird from John Coltrane while writing this.

### Crackling sound in Ubuntu 18[edit | edit source]

After installing Ubuntu 18 it became impossible to listen to Music. Something that pulseaudio does seems to be the reason.

killall pulseaudio

Caveat: Needs to be repeated each time you reboot.

The next solution also seems to work (various forums give this solution)

1) Edit file

/etc/pulse/default.pa

2) Change line

load-module module-udev-detect

load-module module-udev-detect tsched=0

3) Then restart

pulseaudio -k
pulseaudio --start

Notice: Removing pulseaudio from the system does not seem to be a great idea.

### Tips of older Ubuntus[edit | edit source]

In older Ubuntu distributions (e.g. LTS 12) sound may not work either.

* Install all the ALSA stuff (e.g. via the synaptic package manager)
* Then test with Menu System->Preferences-Sound
* Then set the right default volume with Menu Applications->Sound and Video->ALSA Mixer GUID (in particular PCM ! It may be as simple as that ...)

If sound doesn't work search the Ubuntu forums: http://ubuntuforums.org/. A particular good overview posting was:

* http://ubuntuforums.org/showthread.php?t=205449&highlight=alc861vd

To list you sound hardware, type:

aplay -l

If there are none, type:

lspci -v

... and search through the list until you find something like:

00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High Definition Audio Controller (rev 01)

This means that you do have a sound card, but that the drivers or something else is missing....

Anyhow it may take some time (between a few minutes and a few days) to find a solution. Often, the only thing you'd have to do is to add a line to /etc/modprobe.d/alsa-base (needs root permissions). I have for my DELL/Sigmatel:

options snd-hda-intel model=ref

Then, reboot !

Note: To list all drivers on your machine, type:

lsmod

If I understand right, drivers are kernel modules.

### Give permission to insecure web sites[edit | edit source]

Nearly no Java Web site will run once you enabled Java.

Give these sites permission (of course, only do that with your local administration or non-local friendly educational applications...)

jcontrol &

Security tab.

## Application hints[edit | edit source]

### Rhythmbox[edit | edit source]

To edit a playlist (i.e. reorder items), there are two options

* You can drag items up and down (untick "browse" in the View menu, if you need more space)
* You can edit the XML (better for very large lists, maybe do a save before you do this)

.local/share/rhythmbox/playlists.xml

Also, it's a good idea to remember that you can copy this file, if you decide to re-install your machine and start with a clean/new setup

### Who else has Linux nearby ?[edit | edit source]

sudo nmap -O xxx.yyy.zzz.1-255 | grep "Running: " | sort | uniq -c

## Non-standard software[edit | edit source]

Some organization maintain their own Debian/Ubuntu package servers.

### Dropbox[edit | edit source]

Works quite well on Ubuntu 22

If it does not, try man dropbox, e.g.

dropbox status
dropbox start
dropbox update

### Screenshots[edit | edit source]

Most people did agree that Shutter was the best tool

sudo apt install shutter

Shots can be edited and annotated with a built-in editor.
To install as default, read this, Before you can assign the PrtScreen button, you must reset the existing shortcut using backspace.
Tip: Double click when using selection.

Since Ubuntu 18, there is also Flameshot, but unless I missed something it cannot do text.

sudo apt install flameshot

to launch it, type

flameshot gui

The edit will directly appear in the shot.

Neither is as good as Greenshot for Windows IMHO, but both are OK. Since Flameshot is new, it might have bugs (I do not know)

### Shotcut[edit | edit source]

Shotcut is a cross platform free video editor which has good rankings (also on Windows). Tested on oct. 2017 with Ubuntu 16x.

There are different ways to install it. I chose a PPA distribution that seems to be trustworthy. I also had to add a missing library after installing.

sudo add-apt-repository ppa:haraldhv/shotcut
sudo apt-get update
sudo apt install shotcut

First time, launch it in the terminal so you can spot errors if there are.

shotcut

Install this one before if you do not have it.

sudo apt-get install libsdl2-2.0

### Mendeley[edit | edit source]

Mendeley, the bibliography and article manager does have a Debian distribution.

Read Download Mendeley Desktop for Ubuntu.

* Click on the download link
* Install from the package manager that should open

Run it:

mendeleydesktop &

Also, install the libre office and web browser plugins if not already done so.

### Skype[edit | edit source]

E.g. to install Skype, you could

* Add the Skype repository like this in the Synaptic Package Manager (through settings->Repositories->Third-Party Software)

deb http://download.skype.com/linux/repos/debian/ stable non-free

* Reload or update the package information and search for "skype"
* Install the skype package.

### Google Chrome[edit | edit source]

Read How to install Google Chrome (askubuntu)

wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | sudo apt-key add -
sudo sh -c 'echo "deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google-chrome.list'
sudo apt-get update
sudo apt-get install google-chrome-stable

## Security[edit | edit source]

* http://denyhosts.sourceforge.net/faq.html

SSH Keys

* Generating New, More Secure SSH Keys by Pat Regan
* Improving the security of your SSH private key files by Martin Kleppmann

Firewall

Show

sudo ufw status
sudo ufw --help

To allow port 7777 for tcp for everyone:

sudo ufw allow 7777/tcp

To allow port 2049 for TCP and UDP for a given IP (replace your_ip_number with your IP number)

sudo ufw allow from your_ip_number to any port 2049 proto tcp
sudo ufw allow from your_ip_number to any port 2049 proto udp

To allow everything from a given IP

sudo ufw allow from ip_number_here

After that, reload the firewall:

sudo ufw reload

To disable / enable

sudo ufw disable

E.g. for testing purposes ....

sudo ufw enable

## Opinions and alternatives[edit | edit source]

Add yours ...

### DKS[edit | edit source]

* Daniel K. Schneider uses Ubuntu since March 2007, because he got fed up with Mandriva updates not working correctly. I hate all OS's (Unix, Mac, Win) but prefer to work on Unix because it's fairly stable and appropriate for what I do. I also do have Windows machines for doing stuff that needs Win 7. (E.g. Flash, word processing with Framemaker, X3D, Games). Our servers (e.g. for this wiki) run mostly under Ubuntu too. Before we ran Solaris which is much more difficult to install and maintain but extra solid.

* Indeed (it's now August 2007 and I went through a major upgrade) I find that Ubuntu and its packaging system is far more robust. Though I once failed with a non supported package, i.e. Cinelerra that I got from another site. It installed, but crashed on start. Have to try again at some point.

* If your applications crash (e.g. Firefox) check your bloody RAM. It may be defective and you can loose 3 days of work trying to reinstall when there is absolutely no need. Ubuntu is solid, even if the installation can be messy !

* I don't like the new 12.04 Desktop. Not very efficient for people who know what they are doing (see the installation notes on top)

### Alternatives[edit | edit source]

* Linux Mint, can be described as some kind of easier to use Ubuntu. There is also a Linux Mint Debian Edition that is directly based on Debian and it may be of interest to people who want to be closer to Debian. Both editions should behave in the same way. Read the Wikipedia article and Linux Mint 15 A better Ubuntu for the desktop (May 2013).

* If you dislike Unity (the standard Ubuntu 12x desktop) you also could just user another one, e.g. Cinnamon. Read how to Install latest Cinnamon 1.6.4 in Ubuntu 12.10/12.04/Linux Mint

sudo add-apt-repository ppa:gwendal-lebihan-dev/cinnamon-stable
sudo apt-get update
sudo apt-get install cinnamon

Then, log out and you will have the option to use Cinnamon. The normal Ubuntu Desktop will remain there and you can therefore switch back easily....

## Links[edit | edit source]

(there are many others)

Official

* http://www.ubuntu.com/ (home page)
* https://help.ubuntu.com/ (help pages)
* http://ubuntuforums.org/

Other

* http://ubuntuguide.org/