Found the offending part: /etc/grub.d/05_debian_theme which exited with status 1 as it failed on test -d "${GRUB_PREFIX}"; cd "${GRUB_PREFIX}" and GRUB_PREFIX was not set.
As a band aid I cd'd to "/boot/grub" literally. The distribution upgrade must have removed the definition of GRUB_PREFIX, whereever it may have been before. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1078653 Title: upgrade Ubuntu 12.04 -> 12.10 has several problems: grub-pc, apport, older linux versions To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1078653/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs