heken

I recently installed a linux operating system to my computer. So right now i'm running on xubuntu (unsure of the version #) I've been trying to get tekkit classic to run on this computer and have been unable to. Every time I try to launch it launchs the pack but then it stays at a black screen. On the wiki it says to enter this code in the terminal when you cd to the saved location ->( java -jar technic-launcher-latest.jar ) I went to terminal and tried to cd to that location but have been unable to. Since everytime I try it says it cant find the java folder or something like that. I know this may be vague explination and I apologize for that, but if anyone has any ideas on how to fix please tell me. thanks.