Alternatively you could give update-manager another try: Replace your sources.list by the following single line:
deb http://fr.archive.ubuntu.com/ubuntu/ breezy main restricted universe multiverse Open the update-manager, click on "check" and afterwards on "upgrade" to dapper. -- [dist-upgrader] aborts if no "breezy main" is in the sources.list (only breezy-updates main) https://launchpad.net/bugs/55950 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
