You've installed automatix. Unfortunately, there have been many reports of automatix causeing upgrade problems. Ubuntu can't support upgrades after installing 3rd party software such as this.
** Changed in: update-manager (Ubuntu) Status: Confirmed => Rejected -- update-manager fails when upgrading from breezy to dapper https://bugs.launchpad.net/bugs/106098 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs