- From the desktop, press Alt+F2 to launch the Run Application window.
- Type: gnome-terminal then press Enter. The Gnome Terminal (similar to Windows command prompt) will display.
- In the terminal, typesudo cp -p /etc/apt/sources.list /etc/apt/sources.list_backup then press Enter. This creates a backup copy of you original sources list.
- Now typesudo gedit /etc/apt/sources.list then press Enter. The file sources.list will open in the gedit (the Gnome text editor) application.
- Copy the text below (all of it):## Add comments (##) in front of any line to remove it from being checked. ## Use the following sources.list at your own risk. deb http://archive.ubuntu.com/ubuntu edgy main restricted universe multiverse deb-src http://archive.ubuntu.com/ubuntu edgy main restricted universe multiverse deb http://archive.ubuntu.com/ubuntu edgy-proposed main restricted universe multiverse ## MAJOR BUG FIX UPDATES produced after the final release deb http://archive.ubuntu.com/ubuntu edgy-updates main restricted universe multiverse deb-src http://archive.ubuntu.com/ubuntu edgy-updates main restricted universe multiverse ## UBUNTU SECURITY UPDATES deb http://security.ubuntu.com/ubuntu edgy-security main restricted universe multiverse deb-src http://security.ubuntu.com/ubuntu edgy-security main restricted universe multiverse ## BACKPORTS REPOSITORY (Unsupported. May contain illegal packages. Use at own risk.) deb http://archive.ubuntu.com/ubuntu edgy-backports main restricted universe multiverse deb-src http://archive.ubuntu.com/ubuntu edgy-backports main restricted universe multiverse ## PLF REPOSITORY (Unsupported. May contain illegal packages. Use at own risk.) deb http://medibuntu.sos-sts.com/repo/ edgy free deb http://medibuntu.sos-sts.com/repo/ edgy non-free deb-src http://medibuntu.sos-sts.com/repo/ edgy free deb-src http://medibuntu.sos-sts.com/repo/ edgy non-free ## CANONICAL COMMERCIAL REPOSITORY (Hosted on Canonical servers, not Ubuntu ## servers. RealPlayer10, Opera, DesktopSecure and more to come.) deb http://archive.canonical.com/ubuntu edgy-commercial main ## Listen #deb http://theli.free.fr/packages/ edgy listen
- In gedit, press Ctrl+a to highlight the entire contents of the sources.list file. Now press Ctrl+v to paste the copied text.
- Save your changes by pressing Ctrl+s then close gedit.
- Return to Gnome Terminal and typewget -q http://medibuntu.sos-sts.com/repo/medibuntu-key.gpg -O- | sudo apt-key add - then press Enter. This imports the GnuPG (GPG) key to your keyring (basically, this is just a way to verify the authenticity of the repository).
- Now typesudo aptitude update and press Enter. This will update your installed applications using the new repositories.