I have an IDE disk and a SCSI disk on an AHA1520 (ISA card). / and /usr are on the SCSI disk, while /boot is on the IDE disk. Booted from floppy with 'expert' so that I'd be able to load the aha152x driver. Selected 'Upgrade'. Got told that I don't have any Linux partitions to upgrade. :-(
The installation I was upgrading from was 6.1, by the way.
There were a bunch of bugs in the upgrade code, and I'm going to guess that this was one of them. Tim, please try this with beta 3 (out next week), and let us know (loudly!) if this problem persists.
I can't test this because my SCSI card is ISA and expert mode is broken in beta3. :-(((((