QB64 _MOUSEMOVEMENT not reading any input

Question

I am using Ubuntu but am not very experienced with it yet, so this might be an Ubuntu problem instead of a QB64 problem, so I also posted it to askubuntu. Anyway, I wanted to make a program with mouse input, but although _MOUSEINPUT would return -1, _MOUSEMOVEMENTX and _MOUSEMOVEMENTY would only return 0, although _MOUSEX and._MOUSEY would function properly. I haven't used mouse input in QB64 all that much before, so I was still learning how to use it.

To make sure I wasn't just going crazy, I used one of the sample programs off of the QB64 Wiki that use _MOUSEMOVEMENT:

SCREEN 13, , 1, 0
DO: _LIMIT 200
 DO WHILE _MOUSEINPUT
   x = x + _MOUSEMOVEMENTX
   y = y + _MOUSEMOVEMENTY
 LOOP
 x = (x + 320) MOD 320 'keeps object on screen
 y = (y + 200) MOD 200 'remove if off screen moves are desired
 CLS
 CIRCLE (x, y), 20
 PCOPY 1, 0
LOOP UNTIL INKEY$ <> "" 'press any key to exit  

And this is what it does:

image

If I move the mouse, nothing happens.

Any help would be greatly appreciated!