Comment 4 for bug 2031420

I'd thought there might be some special grub handling in ubuntu-release-upgrader but I also tried an upgrade by modifying my /etc/apt/sources.list to change lunar to mantic and then running 'apt-get dist-upgrade' and still encountered the same crash. Additionally, the file '/etc/grub.d/10_linux' starts with the following:

bdmurray@clean-lunar-amd64:~$ head -n10 /etc/grub.d/10_linux
#! /bin/sh
set -e

# grub-mkconfig helper script.
# Copyright (C) 2006,2007,2008,2009,2010 Free Software Foundation, Inc.
#
# GRUB is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.