Your correct, the problem was probably unofficial packages. As for the update-manager crashing, can you boot the live CD again and see if you can reproduce the problem? If you can, start a new bug report. You can link me to it if you want.
Thanks. Closing report. ** Changed in: update-manager (Ubuntu) Status: Incomplete => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/782338 Title: error update to ubuntu 10.10 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs