A friend and I are having trouble running forge on Ubuntu and older versions of windows (XP). I was wondering if operating systems matter because my friend's brother got it to work on Vista and windows 7 and not XP. We've tried everything, and nothing seems to work.
When I start up my Minecraft the box for FML will pop up saying: " FML is setting up your enviornment." but it won't do anything. I'm not sure if I installed it wrong or what. Please help.