Just checked that again, and the journal does get replayed, so the rw fs
isn't being umounted cleanly. I also noticed block device I/O errors on
shutdown.

Digging into this a bit deeper, some observations:

* Whatever this line from /etc/rc0.d/S40umountfs is supposed to do ..

PROTECTED_MOUNTS="$(sed -n '0,/^\/[^ ]* \/ /p' /proc/mounts)"

.. it seems to end up matching the whole of /proc/mounts on a casper
boot, possibly because the mount point "/" appears twice.

* The casper-rw filesystem is mounted on /cow, which isn't accessible
once the boot has completed. Remounting / (the unionfs / aufs) ro
doesn't remount /cow ro (I wouldn't expect it to.)

Given that casper sets up /cow, presumably this is primarily a casper
bug - regardless of the fact that the edgy -> gutsy changes to upstart
seemed to make it worse.

I hope nobody minds me retitling this bug slightly.

** Summary changed:

- failure to umount local filesystems - gutsy tribe 2
+ casper-rw fs not cleanly unmounted on persistent live USB shutdown

-- 
casper-rw fs not cleanly unmounted on persistent live USB shutdown
https://bugs.launchpad.net/bugs/125702
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