I've recently upgraded from to Ubuntu 12.04. When I upgraded, I re-installed Jungle Disk Desktop and it was working fine, but a couple of days later, I started getting a jungle disk error saying to check the application for details. That's when I discovered that I couldn't get to the application. I tried whitelisting the application, but that doesn't seem to work.
This blog talks about how they solved the same problem
In short, you need to enter this into a terminal to create a symlink: