Error with ursina: "No module named Xlib"

I’m trying to use Ursina to make a game. I installed it on my Ubuntu/Debian terminal using "pip install ursina". It seemed to install fine, but any time I try to run anything using ursina, I get this error message:

I’m quite confused and I’ve tried uninstalling / reinstalling it a few times, but to no avail. Can someone help me?