Oui, c´est ce que j´ai fait ( et un pote sous kubuntu l´a fait aussi), il suffit de remplacer hoary par breezy partout dans ton / etc/apt/source.list
deb http://archive.ubuntu.com/ubuntu/ breezy main
deb http://archive.ubuntu.com/ubuntu/ breezy universe
deb http://archive.ubuntu.com/ubuntu/ breezy multiverse
deb http://archive.ubuntu.com/ubuntu/ breezy restricted
deb-src http://archive.ubuntu.com/ubuntu/ breezy main
deb-src http://archive.ubuntu.com/ubuntu/ breezy universe
deb-src http://archive.ubuntu.com/ubuntu/ breezy multiverse
deb-src http://archive.ubuntu.com/ubuntu/ breezy restricted
- ###########Ubuntu Security##############
deb http://security.ubuntu.com/ubuntu/ breezy-security main
deb http://security.ubuntu.com/ubuntu/ breezy-security restricted
deb http://security.ubuntu.com/ubuntu/ breezy-security universe
deb http://security.ubuntu.com/ubuntu/ breezy-security multiverse
deb-src http://security.ubuntu.com/ubuntu/ breezy-security main
deb-src http://security.ubuntu.com/ubuntu/ breezy-security restricted
deb-src http://security.ubuntu.com/ubuntu/ breezy-security universe
deb-src http://security.ubuntu.com/ubuntu/ breezy-security multiverse