I just got a similar problem, where my testing amd64 machine stopped booting after I had to shut it down. Previous boot had occured on May 22th, and quite a lot of packages were updated since that time, including linux-image-3.2.0-4-amd64, which was the running kernel, from 3.2.41-2 to 3.2.46-1.
As others described, I get a complain about a partition UUID not being found, get dropped to an initramfs shell, and after manually running "vgchange -ay" the boot does proceed fine. Any hint about what to look for ? -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org