I just had this issue on a 32-bit machine. I went from 1.98~20100107-1 to 1.98~20100115-1 and was unbootable.
I wouldn't even get the grub prompt. I would get the "error: no such disk" and reboot. I was able to boot a knoppix disk and mount up all my partitions and everything hardware wise is fine. I downgraded to 1.98~20100107-1 and I am able to boot but I do also get the same error as in bug #564252, but at least I can boot. -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org