I'm running KUBUNTU 10.10 amd64 (KDE version of UBUNTU). I went to the kubuntu's kpackagekit and downloaded the one file w/o Java (arduino-core 0018) and it launched the arduino ide automatically. tested the "UNO" board successfully. Performed several uploads then closed the ide program, but couldn't figure out how to re-launch it. Finally downloaded the Java front end/ accompanied program from kpackage and couldn't select the correct serial/USB port. Had only one choice. I then tried it on my windows system and it worked fine. What file do I need to launch the arduino-core 0018 and where is it located.
(this linux thing has been a steep learning curve!)