Uno freezes IDE under Linux64

Hello,

I am very new to Arduino and I take part in a robotics course at the university I attend.

We have an Arduino Uno (I dont know more parameters) and it does not work with the newest IDE I ve downloaded from this site.
The problem is that under my Debian 64 the IDE freezes when Uno is connected with USB. More precisely it freezes if I try to open Tools menu to set the board and port.
It has some connection with this RXTX library. I ve read somewhere (sorry but it was in school using a school computer) that it may be outdated and buggy that s why it causes freezing - so I downloaded a new one and replaced the old with it (librxtxSerial.so, RXTXcomm.jar). It did not solve the problem.

Have you got any idea or workaroud what to do to make it work?

I have tried all the troubleshooting tips I think, but it does not work.