Yes this is due to unofficial repos, see bug 58424 Also it is probably advisable to use "gksu update-manager -c -d" rather than apt-get dist-upgrade as it has special magic to make upgrades work better
-- Update To Edgy fails and needs manual intervention https://launchpad.net/bugs/63622 -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
