Since 1.0 update, ProtonGE10-10 version fails to run Le Mans Ultimate and the game crashes while loading a track. Thankfully, the community put together a custom ProtonGE version specifically for LMU so we will be using that to fix this problem until the fix is upstreamed properly.

I am currently using Bazzite with AMD cpu and gpu. You can download the custom proton version called "GE-Proton10-4 with LMU fixes" from the link below.

Custom ProtonGE with LMU fix[github.com]

Download the file named " GE-Proton10-4-LMU-fixbuild.tar.gz" and extract the folder in it into Steam's compatibility tools folder as below.

/home/<username>/.steam/steam/compatibilitytools.d/

This is for Bazzite. Other Linux distros can have different install locations so you might have to do some digging to find where Steam is installed. Also, folders with '.' in front of them, like ".steam" are hidden folders, so make sure hidden folders are visible in your file browser settings. Once you extract the folder there, it should look like the following:

/home/<username>/.steam/steam/compatibilitytools.d/GE-Proton10-4-LMU-fixbuild/

Once that is done, in your Steam library, right click LMU, click "Properties," then click "Compatibility" tab and choose the custom Proton version you have just downloaded and extracted. Now the game should work. Tested in current build of LMU as of 07/28/2025. If menu screen gets stuck when you click "Resume," in game, just press "ESC" and click "Resume" again.

See you on track!