You may be experiencing this one https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/2067071 take a look at /var/log/dist-upgrade/apt.log and see if the crash matches the bug above, that's what's happening to me
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2067077 Title: Upgrade app Crash when trying to upgrade from mantic minotaur to noble numbat To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/2067077/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
