see BUG#37430 for some details. Also see BUG#37435 for why it gets really painful later on.
Basically, if your machine crashes around the time of the dist-upgrade, you’re totally screwed. mkfs and re-install.
I’d hate to have not made /home a different partition from /.
I currently don’t have much confidence in an easy upgrade for my laptop considering what I’ve just gone through for my desktop. I’m now downloading the flight 5 install CD so i can re-install from stractch. urgh. not happy jan.
My recommendation for upgrade is a full backup of everything beforehand and if anything even remotely goes wrong, restore the backup.
Naturally I didn’t do this for the desktop. but hey, the laptop is more critical. I’ll be doing it for that, as I always do.