I have been playing SecondLife on Ubuntu 12.10 for a couple of months with no problem. You all should have fun as I have, so here's how I do to get all of viewers running. I installed 3D scene graph from Ubuntu Software Center. Yes, I was not sure which one to install and chose all 3D scene graph related files. Let me know if it helps you. Yes, I installed debian and fonts etc etc as others suggested in the forums. To answer your question how I figured this out, I typed "Virtual Reality" in the Ubuntu Software Center search. Be sure to reboot after install.
-Wild Newbie **Only uploaded images may be used in postings**://ubuntuforums.org/images/smilies/guitar.gif" border="0" alt="" title="Guitar" />