Hey All,
I had a little trouble getting things to run on Ubuntu Edgy AMD64. I had to install the package "librxtx-java" first. Then I had to fix the CLASSPATH reference to the local copy of RXTXcomm.jar. It needs to point to "/usr/share/java/RXTXcomm.jar". Next I had to make two changes to the dist/arduino script. I had to again, swap the reference to the installed RXTXcomm.jar and then I had to change the LD_LIBRARY_PATH to point to /usr/lib instead of the {cwd}/lib so that it will find the correct .so files.
I can supply patches if needed.