Your system information

• Steam client version (build number or date): 1773983034 (Fri, Mar 20, 2026 05:46 UTC -08:00)
• Distribution (e.g. Ubuntu): Fedora 44 KDE
• Opted into Steam client beta?: [Yes/No] Yes
• Have you checked for system updates?: [Yes/No] Yes
• Steam Logs: [generate by running this command in a terminal tar -zcvf ~/Desktop/steam-logs.tar.gz ~/.steam/steam/logs]

steam-logs.tar.gz

• GPU: AMD Radeon 7900 XTX

Steps for reproducing this issue:

1. Add gamemoderun %command% to the launch option of any game
2. Start the game
3. Check the logs (Game does not start)

In the logs I can see

Mär 20 14:27:09 steam[57971]: /bin/sh: 1: gamemoderun: not found

Other overrides also do not work, direct path does not help either.

I guess technically any system-wide app cannot be used since it's looking inside the runtime, but this is an example.