This morning, I turned on the computer and got the problem. "The disk
drive for /backup is not ready yet or not present"

I can swear lvbackup was owned by the root group when I turned it off,
and I assure you I've never done anything with udev.

I checked ownership : lvbackup was this time owned by the disk group and, 
surprise, lvroot (which holds the system root), was owned by the disk group too 
(but was mounted)!
I performed a chgrp on lvbackup, and type reboot in a terminal.

Same problem on boot, but this time lvroot is owned by the root group, as it 
was before.
I changed ownership again, but this time performed the reboot through the 
graphical interface.
And, guess what ? It booted fine and lvbackup was owned by root.root.

This is pretty freaky, isn't it ? My guess is the "reboot" process
launched through the graphical interface actually holds some data in
memory, while the reboot command in a terminal performs a clean reboot.

I performed a "shutdown" through the GUI, then pressed the power button.
Boot failed.

Finally, I can say that ownership *is not* persistent across reboots,
making this bug more annoying than I thought.

-- 
lucid hangs on boot because of device ownership
https://bugs.launchpad.net/bugs/557909
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