This is LOVE 0.5.0 (Salted Nuts).
INIT love.filesystem [PhysFS]
INIT love.graphics [OpenGL/DevIL/FreeType]
Could not init SDL_VIDEO: No available video device
QUIT love.graphics [OpenGL/DevIL/FreeType]
QUIT love.filesystem [PhysFS]
OK, X is the graphical thingy, every screen etc is drawn on X.
You might know you have a desktop environment (like Gnome or KDE), however even that is run on X.
Basically: X is the program on which all programs with a GUI work.
You might be able to recognize an empty X screen when you boot your pc, when it's empty it's background is totally covered with grey dots, and the mouse pointer is a cross.
That's enought introduction to X.
So when I said if you were able to run other X programs, I meant something like firefox (any program with a GUI will do).
BTW, there is a way to open it with Nautilus/Konqueror/whatever you use for opening files. As you have said you have ubuntu, that means you have Gnome, which means you have Nautilus (which is basically a clone of the 'explorer' found in windows).
If you don't understand something, please ask. The linux (and especially the ubuntu) community doesn't mind to help. (Yeah, I'm using ubuntu too)
just wondering what kind of video card do you have and did you install any drivers for it (or are you using what ubuntu installed when you set the system up)