I'm running unstable, and have been affected by this bug for a few weeks now, which is really annoying. After reading this bug report, I decided to set the -x flag on /usr/share/initramfs-tools/scripts/local-top/lvm2, the problem was quickly found: this script refuses any path which does not start with /dev/mapper/. The root device is given as /dev/disk/by-uuid/*, so it is not activated.
Simple workaround: change the grub commandline from root=UUID=* to root=/dev/mapper/vg-root (fill in your volume group and root logical volume name). Then it will activate and boot normally. I expected that this should be done by changing /etc/fstab and running update-grub, but grub will put UUID values in /boot/grub/grub.conf anyway. So it must be done in /boot/grub/grub.conf, and repeated every time update-grub is run (which isn't ideal, but a lot better than typing commands every time the system boots). I'm guessing this bug was triggered by a change in grub to always write UUIDs to its config. Still, it should be fixed by changing the initramfs-tools script to make it allow the UUID-based path. Thanks, Bas
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