I had the same symptom (well, the message "cryptsetup: failed to setup lvm device", but I didn't wait for initrd to drop me into busybox).
Inspection of the initrd via mkdir /tmp/initrd && cd /tmp/initrd zcat /boot/initrd.img-VERSION | cpio -id showed that, among others, sbin/lvm2 was missing. Sure enough, dpkg -l lvm\* confirmed that the lvm2 package had somehow (unintentionally) been purged, so I ran aptitude install lvm2 update-initramfs -u -k VERSION et voilà!, problem solved (for me). HTH, -Tobias -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org