Update - 15:09 17/06/26 - Embark Studios posted an official update on the situation. Telling people to use Proton Experimental on the special bleeding-edge Beta which has a fix:
![Raiders! We have seen your reports since the 1.33.0 update that ARC Raiders has stopped working on Linux and Steam Deck. We've identified the issue together with the Proton team. A partial fix is currently available on the Proton Experimental [bleeding-edge branch]. You first have to select the specific bleeding-edge 'beta'/branch for Proton Experimental and then also have Proton Experimental as the forced Compatibility tool for ARC Raiders. Please check [the official Proton page](https://github.com/ValveSoftware/Proton/wiki/Proton-Versions) on how to enable it. We will let you know once we've fully resolved the issue. //Ossen Raiders! We have seen your reports since the 1.33.0 update that ARC Raiders has stopped working on Linux and Steam Deck. We've identified the issue together with the Proton team. A partial fix is currently available on the Proton Experimental [bleeding-edge branch]. You first have to select the specific bleeding-edge 'beta'/branch for Proton Experimental and then also have Proton Experimental as the forced Compatibility tool for ARC Raiders. Please check [the official Proton page](https://github.com/ValveSoftware/Proton/wiki/Proton-Versions) on how to enable it. We will let you know once we've fully resolved the issue. //Ossen](https://uploads.golmedia.net/uploads/articles/article_media/18705205771781708858gol2.webp)
On Desktop Linux for example it looks like this:

Then you need to let Proton Experimental update, and set ARC Raider to use Proton Experimental in its properties.
Original article below:
Embark Studios rolled out a new update for ARC Raiders, which includes more people moved over to Denuvo Anti-Cheat that's causing problems on Linux / SteamOS.
For a lot of people ARC Raiders uses Easy Anti-Cheat, but they're gradually moving more players over to Denuvo Anti-Cheat as it seems Epic's EAC is just not good enough for them. It's one of the few very popular games that has worked on Linux since release, so to see it suddenly broken is a shame. Players are now just greeted with a "forbidden tools error code: ARAV1011" kicking them out.
In the latest release notes it mentions:
"As part of our ongoing efforts against unfair play, we’re continuing to expand Denuvo Anti-Cheat to more players. We’re pleased with the progress so far, and expect further improvement as we scale up.
The only update I can see about this situation has been posted in their Discord, where an Embark rep said:

That was 8 hours ago and no update in the bug report post since then. Hopefully the wait won't be much longer. I did send Embark a message directly before seeing that - no reply yet.
I do hope with the Steam Machine and Steam Frame coming this Summer that we see less issues like this. I wrote before here on GamingOnLinux how the anti-cheat situation overall did worry me and even when games are enabled to work, they're still (clearly) not testing enough. Perhaps things will get better though with even Epic Games and Electronic Arts looking for Linux developers to work on their anti-cheat systems.
See more about what games work on Linux / SteamOS on our anti-cheat page.



