The problem is very likely caused by xorg-edgers ppa. You can use ppa- purge to uninstall it and revert to the packages from the official repository. Then run the release upgrade again and tell if it helped.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1040830 Title: Cannot upgrade from 10.04 to 12.04.1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1040830/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
