Does it work if you install the PCSX2 flatpak from Software Manager? I haven’t tried it myself yet, but this page may help and has more detail about the installation methods:

https://pcsx2.net/docs/setup/linux/

We thought the leaks were for Switch 2, but this dream reveals that Virtual Boy 2 is the next console.

Yeah, drm-free storefronts like GOG are the best solution I think. I love Steam and Proton, but if Valve ever goes public that would all change for the worse.