

For what? It’s just Linux Kernel. If you speak about a specific operating system or distribution, then you can call it by name. Otherwise I’ve recently taken to calling it “Linux based operating system”, when I try to avoid to call it by name (EndeavourOS).
For me game is running. I have the newest update of Marvel Rivals Version 20250515. In the past it would not run with Proton Experimental and had to switch to Proton 10.0-1 (beta) (still do). Also had to add
SteamDeck=1 %command%
, to make it run again. It runs right now as I write.Sometimes after a system update I need to restart, otherwise games don’t launch. So maybe do system update now and restart entire PC and operating system, if you didn’t already.