I upgraded a 9.1 system (which had been powered off while running, so had partitions marked as unclean) to 9.2 but the installer did not see the 9.1 system at all until I created the device nodes by hand and e2fsck'ed the / partition.
The installer *should* (IMESHO) offer to check existing partitions before deciding about upgrades if it finds any partitions flagged as having errors, and *should* have another checkbox offering to do same and try again from the upgrade screen even if an existing system is discovered (there might be more) but there are unclean partitions remaining. Cheers; Leon
