I'm a Ubuntu linux user myself and I haven't seen this problem myself. I am not using 11.X ubuntu yet so maybe that makes a difference.
I'm using 10.04. Perhaps this is a good time for me to try and install Ubuntu 11.X on a spare computer and try it out.
Some other thing I can think of that might make a difference is what version of Java you have installed. I always recommend people to use the Sun JVM as it is more widely used and things are generally better tested and more stable with that.
Unfortunately Ubuntu not too long ago decided to start shipping with OpenJDK on principle. I do agree with the principle, but at the same time I really prefer something that works with the least amount of trouble.
Luckily you can still install sun JDK from the synaptic package manager.
Go to System >> Administration >> Synaptic package manager
Then search for sun-java6. Then select sun-java6-jdk and install that. It should replace your open jdk install.
Maybe that isn't the problem here, but in any case I recommend using sun-jvm as I'm sure it will save you trouble down the line.
Try that and let me know how it goes.
In the mean time, I'll try to install Ubuntu 11.X on another machine. I guess we'll see more user starting to use that, so its probably a good idea for me to try that out and see what happens.
Kris De Volder -- SpringSource