It may or may not have been /intentional/, but it's clearly a /bug/ to
convert /dev/mapper entries to UUID; and as soon as we can identify the
code responsible for such migration (which we haven't yet), that should
be fixed.

> When I change all LVM entries to /dev/mapper other bugs get in the
> way of testing. I just did that and also removed all snapshots. What
> happens then is that /opt can't be mounted (/dev/mapper/vg0-opt)

If you convert all your fstab entries to /dev/mapper *except* for the
vg0-opt entry that's currently giving you problems, and you create
snapshots, does the boot work as expected?

> Ownership permissions of /dev/mapper/vg0-opt are root:disk

I don't see anything wrong with that; this is the default group
ownership set by udev for block devices, and I have entries under
/dev/mapper here that are owner root:disk.  (I also have other devices
that are owner root:root; the difference appears to be whether the
devices were activated in the initramfs or in the root system.  The
devmapper device here that's owned by root:disk is an encrypted test
partition that is only decrypted after chrooting to the rootfs.)

Do you know of any reason why vg0-opt would be activated after the end
of your initramfs instead of at the same time ?  Can you attach a
/var/log/udev.log for this system?

-- 
When snapshots exists, mountall will not mount the parent partition
https://bugs.launchpad.net/bugs/563902
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