Try the following instructions from the ubuntu forums. The text in blue is just a direct copy-paste. I haven't installed Jaunty yet, so I haven't run into the issue.


http://ubuntuforums.org/showthread.php?t=1153900

HOW TO: Get Frostwire to run in 9.04


If you've tried to install FrostWire 4.18 on Ubuntu 9.04 but get Fatal errors on startup, follow this short guide to get you up and running.

1. Install "Ubuntu Restricted Extras" from Add/Remove...

2. Go into terminal and run the following command, and choose the option corresponding to Sun Java:

sudo update-alternatives --config java

3. Reinstall Frostwire using the deb provided on frostwire.com

That's it. It should run now.