I’ve used ALVR to play Underdogs on my Pico 4 on Linux. It can be a bit flakey though.
Might be worth trying WiVRn, which I’ve linked docs for in reply to the other guy :3
Nice. I didn’t know about that and will check it out later. I am using ALVR to play modded Beat Saber multiplayer on linux and have a very well working setup and configuration by now but it’s still not great compared to Virtual Desktop on Windows with my Pico 4.