I just got a new laptop for the school, and I was trying to install Minecraft. it only has Ubuntu 10.04 LTS and i didn't find any program to run the .jar properly. I'm really new in Ubuntu, if anyone knows what program should i download, please tell me. This PC has OpenJDK Java 6 Runtime and Sun Java 6 run time, but i don't know anything about these programs. when i try to open with any of those, it says: the file is not marked as executable. Please help!