Ubuntu has done it again.
I've upgraded my development machine to Karmic Koala, a.k.a. Ubuntu 9.10.
Once again, the Ubuntu upgrade process was trouble-free, although I think I might have hit some congestion at the download servers because the download was slow for a bit. A bit of patience and all was well again.
Now I am up and running on 9.10, and hoping to start learning about all that is new.