Comment 59 for bug 428435

I hit this a few weeks ago when upgrading from Jaunty to Karmic beta, here is the upstream I found:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=541823

At the time I asked a few colleagues about it and no one had hit it so I assumed something wrong with my own setup. My original setup was Alternate Install + LVM encrypted root (Jaunty).

My workaround was to add this to kernel options to test botting once:
cryptopts=target=sda1_crypt,source=/dev/sda1,lvm=bianca-root root=/dev/mapper/bianca-root ro

Then once I confirmed it worked, I made it permanent by adding it to kopts in /boot/grub/menu.lst (I don't use grub2):
# kopt=cryptopts=target=sda1_crypt,source=/dev/sda1,lvm=bianca-root root=/dev/mapper/bianca-root ro

Make sure cryptopts is before root= or else this won't work.