I'm most of the way through an upgrade, but I don't have the nVidia driver that gives reasonable 3D performance (which is thus a requirement for running the SL client) installed yet... so I'm stuck in First Life for a while.
I hope I'll get past this and see you all soon!
P.S. I'm really, really sorry, Mr. Fogerty...
[UPDATE] Thanks to the good folks on the Ubuntu Forums, I was able to install the newest nVidia driver,. and it now seems to be running reasonably. There's a little remaining work to do, but we're over the hump, I can return to SL... and Feisty Fawn is well worth the move.