Warhammer 40,000: Space Marine 2 update is causing issues for SteamOS / Linux

1 Sep 2026 at 10:17 am UTC | Last updated: 1 Sep 2026 at 10:49 am UTC
By Liam Squires-Hand

Something in the latest update to Warhammer 40,000: Space Marine 2 has been causing crashing issues for SteamOS / Linux players - but you may be able to fix it.

There wasn't any major update actually announced recently, but it seems something on their back-end is now causing the game with Proton Experimental to crash with Easy Anti-Cheat on SteamOS / Linux systems like Steam Deck, Steam Machine and Desktop Linux.

There's a big post on the Steam forum with lots of replies about it, with some suggesting older Proton versions like Proton 9 work with it and in a bug report on the Proton GitHub, another user said Proton 11 works as well. Valve have the game set for Proton Experimental by default, which you can easily switch it yourself though.

Hopefully Valve will figure out why Proton Experimental is causing crashes, or perhaps the developer Saber Interactive will be able to sort it out. Until then, try a different Proton version.

You can see more about SteamOS / Linux anti-cheat compatibility on our dedicated page.

Release Date: 📅 24th May 2024Platform: ⚛ Proton / Wine (Windows)Devs:Saber Interactive, Focus EntertainmentOfficial links:Steam 🌐 External Sources: steamcommunity.com, GitHub - Proton Article taken from GamingOnLinux.com. Tags: Anti-Cheat, Proton, Steam Deck, Steam Machine, Steam, Warhammer | Apps: Warhammer 40,000: Space Marine 2 7 Likes Some you may have missed, popular articles from the last month:OpenTS is a new open-source reconstruction of Command & Conquer: Tiberian SunTom Clancy's Ghost Recon Wildlands has Easy Anti-Cheat removedSteamOS 3.9.0 Preview brings major updates to desktop mode, Linux kernel, WiFi and moreNVIDIA GeForce NOW cloud gaming for Linux levels up and leaves Beta All posts need to follow our rules. Please hit the Report Flag icon on any post that breaks the rules or contains illegal / harmful content. Readers can also email us for any issues or concerns.