I have only fully succeed in running a minecraft server on pc
The problem i have with pc, is that mine is VERY slow
I have tried very hard on mac and i can only get on it internally.
Now, I could try ubuntu but i dont want to go through the trouble to make a server just so it wont work
If you know a way that allows people outside of my network to join on ubuntu
please include a link to guide me through this

just for clarification im 100% sure i can port forward

From what I've heard, it works quite well.