Okay, I could fix this by uninstalling "flightgear" - after having taken a look at the logs that ubuntu-bug-report had attached to this bug...
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1310235 Title: Cannot upgrade from Ubuntu 13.10 Saucy to 14.04 Trusty To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1310235/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs