Been trying to get this running for a few days now with quest 2 on pop OS 22.04 as well but with a 3080. Unfortunately I'm still getting error 307 steamvr fail with this on both normal and beta steamvr. ALVR connects and disconnects constantly at the pairing screen for me saying the connection was refused as it was already in use.
I've been struggling trying to get ALVR working on POP_OS 22.04 with a quest 2 and a 3080 for about 12 hours now over the course of a few days. Still getting various errors and it essentially just disconnects and reconnects constantly. I did get it working momentarily (into the steamvr home) using the linux beta of steamvr but it was bugged out anyways and I have been unable to replicate it since.
Well this looks amazing. Added to my wishlist on GOG in the hopes it goes on sale sometime since I need to not spend money right now