package xulrunner-1.9.1 1.9.1.4+nobinonly-0ubuntu0.9.10.1 failed to install/upgrade: Unterprozess installiertes post-installation-Skript gab den Fehlerwert 127 zurück

Had the same problem, upgrading from 9.04 to 9.10.. System cannot boot now, "Gave up waiting for root device. . . . Alert! /dev/disk/by-uuid/## does not exist. Dropping to a shell" ,

tried mount -o remount,rw / as per:
[ubuntu] waiting for UUID error 9.10 upgrade - Ubuntu Forums - http://ubuntuforums.org/showthread.php?t=1309452

but still cannot boot ..

Actually, first I get "Gave up waiting for root device", then I do ln -s ..., exit as per

Bug #362315 in cryptsetup (Ubuntu): “blkid fails to identify old LUKS partition volumes” - https://bugs.launchpad.net/ubuntu/+source/cryptsetup/+bug/362315 (though I have no LUKS partitions)

... Then booting into 9.10 breaks again with "One or more mounts listed in /etc/fstab cannot yet be mounted", then I do mount -o remount,rw, exit - and only then 9.10 boot completes..

Hope I learn how to boot into 9.10 automatically - but I'm not sure how could the boot / mounting problem be related to xulrunner... Maybe it is because my root partition is ext2 - and I think the xulrunner problem could be because there was a firefox process active in the background during update, however that was Mozilla's executable, not the default ubuntu one..