Comment 4 for bug 739439

resolved by going into live cd and using mdadm to reassemble my boot raid 1 volume, mounting it, changing the menu.lst to old_menu.lst and renaming menu.lst~ to menu.lst, after rebooting back up found the menu.lst that was not working had changed all my file locations to /boot from just /
Not sure why the upgrade script renamed all the file locations in the menu.lst file but for me it's resolved.