Im running it on Linux (EndeavourOS) through steam. I run it with ProtonGE and have 0 issues.
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We play on Linux. it stopped working a few months ago when they released a certain patch.
I'll check what I had to change, but it was pretty straight forward. I think I only changed the proton version to experimental, but not 100% sure if that was the only thing. Definitely change this and try.
We play on an intel/nvidia pc and an amd/amd pc, so it works on either.
If there's more, i'll add it to my post, I can't check right now but in a few hours.
Just checked: nothing in the launch options, simply change Compatibility to "Force the use of a specific Steam Play compatibility tool" and choose "Proton Experimental".


Works great:

My performance settings (FPS capped at 125 because my monitor is only 60Hz anyway):

Uncapped FPS ~200fps:

Choosing Experimental worked, thank you so much!
Some people on r*ddit reported that their game crashes if they run it in DX11 with the latest updates: if you've previously added "-d3d11" or something similar to the launch arguments for whatever reason, try removong them (I'll write some instructions here when I get to my PC).
Another thing you can try is resetting graphics settings and deleting caches - it did solve some crashes for a friend on mine though he was on Windows (again, instructions when PC)
I've had the game for over a year and for the most part it worked no problem on Ubuntu, but there were odd times it didn't for some reason.
Nvidia driver was the issue one time, and the other was resolved by changing proton version. I'll look into if it runs fine on my box tomorrow.
*tomorrow: I had some 403 errors at the title screen for a couple minutes, but I eventually got in. "Proton Experimental" is the version I use, nvidia driver version is 580.