I tried the howto this morning and it failed. I guess the howto may work for a vanilla  desktop pc with ide drives, but I can attest to the fact that it fails completely for scsi drives. I have several rackservers spanning IBM x345 and Sun V20Z servers and the upgrade failed on both.

The Howto needs to address the inability to find the bootimage on scsi drives.

At least it was easy to terminate the failed Upgrade using Grub and that is a bonus.