When I had my b0rked Breezy-to-Dapper upgrade that I was attempting to rescue last week, I hung out in #ubuntu (I think on freenode) for a couple hours. The folks wot were answering questions there highly recommended against Automatix, and suggested EasyUbuntu instead.

I installed Automatix on my Breezy system, and it worked rather nicely. There's a chance that that is what b0rked my upgrade, however. I'm not really looking into it that hard, though.