Gaming on Linux has grown leaps and bounds and it's only getting better. Game Pass Ultimate though, I'm guessing you're gonna have a rough time. That's built for Window's ecosystem. So more than likely that's going to be a very sore point. The streaming Game Pass can and does work on Linux, but if you're against that then Linux might not be for you.

Steam has gotten to the point on Linux where it's basically just install and run, as long as you have compatibility for all games turned on. Very very very few games haven't worked for me or even require little tinkering anymore. That being say I pretty much really only play Indie games.