Thanks for reporting this bug and help in making Ubuntu better, and sorry for the long time without an answer. Thanks also Martin and Jan for the detailed report and info. In the case of the original report the relevant logs from /var/log/dist-upgrade are missing to investigate further. In the case of the logs provided by Jan, it seems that grub is installed not in the appropriate place, which may explain why the same problem arises at each upgrade and why grub-install would fix it. In any case if this is still an issue please feel free to mark the report as "confirmed" again, or consider to convert it into a question to get help and install grub in the appropriate place.
** Changed in: ubuntu-release-upgrader (Ubuntu) Status: Confirmed => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1059231 Title: do-release-upgrade fails to configure properly Grub from Precise to Quantal. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1059231/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs