Note: this guide was written in 2020 and will probably be outdated for modern systems. You probably want to look at a different guide like https://lvra.gitlab.io/ instead - it also includes guides specific to games and other hardware. I haven't tried out their guide yet, but it looks of good quality to me and there is also a Matrix community available.
I've bought the Valve Index VR headset and wanted to play on Linux. I had done a lot of tinkering with my Linux Machine up to this point so quite a few things on the headset initially had issues working alright.
I have listed all of the problems I encountered on ArchLinux with Valve Index and Steam VR in this post and how I managed to solve nearly all of them.