Bon hobes :
sudo cp /etc/apt-sources.list /etc/apt-sources.list.sav
Pour sauvegarder ton ancien sources.list, puis :
gksudo gedit /etc/apt/sources.list
Et tu vas remplacer le contenu par :
deb http://fr.archive.ubuntu.com/ubuntu/ feisty main restricted
deb-src http://fr.archive.ubuntu.com/ubuntu/ feisty main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://fr.archive.ubuntu.com/ubuntu/ feisty-updates main restricted
deb-src http://fr.archive.ubuntu.com/ubuntu/ feisty-updates main restricted
## Uncomment the following two lines to add software from the 'universe'
## repository.
## 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
## universe WILL NOT receive any review or updates from the Ubuntu security
## team.
deb http://fr.archive.ubuntu.com/ubuntu/ feisty universe multiverse
deb-src http://fr.archive.ubuntu.com/ubuntu/ feisty universe 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://fr.archive.ubuntu.com/ubuntu/ feisty-backports main restricted universe multiverse
deb-src http://fr.archive.ubuntu.com/ubuntu/ feisty-backports main restricted universe multiverse
deb http://security.ubuntu.com/ubuntu feisty-security main restricted
deb-src http://security.ubuntu.com/ubuntu feisty-security main restricted
deb http://security.ubuntu.com/ubuntu feisty-security universe
deb-src http://security.ubuntu.com/ubuntu feisty-security universe
# deb http://edevelop.org/pkg-e/ubuntu edgy e17
# Medibuntu (ex-PLF)
## Merci de rapporter tout bug sur https://launchpad.net/products/medibuntu/+bugs
# deb http://medibuntu.sos-sts.com/repo/ edgy free non-free
# deb-src http://medibuntu.sos-sts.com/repo/ edgy free non-free