Here is what I just did.
Downloaded version 0022 from:
// it downloaded to my /home/mark/Downloads directory
// open terminal from ubuntu menu
Applications->Accessories->Terminal
// go to downloads directory
cd ~/Downloads
// untar the downloaded file
tar -vxzf arduino-0022.tgz
// change directory to replace librxtxSerial library
cd arduino-0022/lib
// backup original lib
mv librxtxSerial.so librxtxSerial.so.orig
//find librxtxSerial library that works for this system
find / -ls 2>&1 | grep -i librxtxSerial
if librxtSerial library is not found somewhere in a /usr/lib subdirectory
// this will require root password
sudo apt-get install arduino
// rerun the find command
else
// found it in /usr/lib/jni
// copy it to arduino-0022/lib directory
cp /usr/lib/jni/librxtxSerial.so .
// go up one directory
cd ..
// exec arduino software
./arduino