Craig Layne

This guide is probably one of the first, most essential things to do to any Ubuntu install. This is specifically for Ubuntu Karmic, but can be used as a reference point for other versions.

The Graphical Way:

1. Go to System => Administration => Synaptic Package Manager => Settings => Reposotories
2. Here you can select which sources are to be used. You can also manually add sources here.

The Command Line Way (Easier IMO):

1. First off, open a console, and make a backup of your current sources file

sudo cp -i /etc/apt/sources.list /etc/apt/sources.list_backup

2. Then you can open the sources file to be edited

sudo gedit /etc/apt/sources.list

3. Now you can add new sources in the editor that pop’s up. Below is a copy of my sources file.

#deb cdrom:[Ubuntu 9.10 _Karmic_Koala – Release i386 (20081029.1)]/ karmic main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://gb.archive.ubuntu.com/ubuntu/ karmic main restricted
deb-src http://gb.archive.ubuntu.com/ubuntu/ karmic main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://gb.archive.ubuntu.com/ubuntu/ karmic-updates main restricted
deb-src http://gb.archive.ubuntu.com/ubuntu/ karmic-updates main restricted
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://gb.archive.ubuntu.com/ubuntu/ karmic universe
deb-src http://gb.archive.ubuntu.com/ubuntu/ karmic universe
deb http://gb.archive.ubuntu.com/ubuntu/ karmic-updates universe
deb-src http://gb.archive.ubuntu.com/ubuntu/ karmic-updates universe
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://gb.archive.ubuntu.com/ubuntu/ karmic multiverse
deb-src http://gb.archive.ubuntu.com/ubuntu/ karmic multiverse
deb http://gb.archive.ubuntu.com/ubuntu/ karmic-updates multiverse
deb-src http://gb.archive.ubuntu.com/ubuntu/ karmic-updates multiverse
## Uncomment the following two lines to add software from the ‘backports’
## repository.
## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://gb.archive.ubuntu.com/ubuntu/ karmic-backports main restricted universe multiverse
deb-src http://gb.archive.ubuntu.com/ubuntu/ karmic-backports main restricted universe multiverse
## Uncomment the following two lines to add software from Canonical’s
## ‘partner’ repository. This software is not part of Ubuntu, but is
## offered by Canonical and the respective vendors as a service to Ubuntu
## users.
deb http://archive.canonical.com/ubuntu karmic partner
deb-src http://archive.canonical.com/ubuntu karmic partner
deb http://security.ubuntu.com/ubuntu karmic-security main restricted
deb-src http://security.ubuntu.com/ubuntu karmic-security main restricted
deb http://security.ubuntu.com/ubuntu karmic-security universe
deb-src http://security.ubuntu.com/ubuntu karmic-security universe
deb http://security.ubuntu.com/ubuntu karmic-security multiverse
deb-src http://security.ubuntu.com/ubuntu karmic-security multiverse
## Medibuntu – Ubuntu 9.10 “karmic koala”
## Please report any bug on https://bugs.launchpad.net/medibuntu/
deb http://packages.medibuntu.org/ karmic free non-free
deb-src http://packages.medibuntu.org/ karmic free non-free
# Google software repository
deb http://dl.google.com/linux/deb/ stable non-free

Be sure to save the file and return to the console.

*Note: My sources file contains sources that require keys to work correctly. Read below to learn how to Add Reposotory Keys.

4. Finally in a console perform

sudo apt-get update

And you now should have successfully added new software sources.

Adding Repository Keys:

If you copied my sources list, or are planning to use the mediabuntu, or google repo’s you will need to add keys to your sources list.

To add mediabuntu key

wget –quiet http://packages.medibuntu.org/medibuntu-key.gpg -O – | sudo apt-key add –

To add Google Key:

wget –quiet http://dl.google.com/linux/linux_signing_key.pub -O – | sudo apt-key add –