I'm attempting to upgrade my 10.10 powerpc to 11.04, and hoping for the best. I haven't ever used upgrade before, but I backed everything up.. Just in case.
I'll have to stick to 'Ubuntu Classic,' as I don't think the new Unity interface will work on an old G4 processor..
Also, you should rename this topic to Ubuntu 11.04 + PSN Hack. Just a thought..
[Edit]
Yup, had to switch to Ubuntu Classic, but the upgrade went well.
[Edit 2]
Uh oh, it won't restart and freezes..