That didn't last long - Blue Protocol: Star Resonance anti-cheat causing problems on Linux

Blue Protocol: Star Resonance was just updated, as it seems the initial build did not actually have any anti-cheat enabled but now it does.

It worked initially apart from a few videos, but an update was released 4 hours ago that currently doesn't have any public announcement from the developer. But, looking on SteamDB we can see this update actually added in Anti-Cheat Expert (ACE). Seems they initially just forgot to even add the anti-cheat. Bit of a woops.

On Desktop Linux (Kubuntu 25.10) the game now doesn't seem to launch at all with Proton 9, Proton 10 or Proton Experimental. None of them work. However, curiously, the latest GE-Proton 10-20 does actually still get the game to launch on Desktop Linux for me. All seems fine for a while and then — crash. The game will just abruptly quit on you. So it's still problematic.

However, it does still run on Steam Deck with SteamOS (tested on my LCD Steam Deck). With Proton 9 it loaded up without issue and so far I've not seen it crash at all like it does repeatedly on Desktop. So it seems our original report with word from the developer is now correct about the compatibility with Desktop Linux not supported at all.

Pictured - Blue Protocol: Star Resonance on Steam Deck

A shame that Linux gamers have to continue to deal with the nuisance that is kernel-level anti-cheat. We can clearly see that Linux will run these games nicely but there's simply no solution in some cases like with Battlefield 6. An ongoing problem that reduces our available multiplayer titles.

Our anti-cheat page was updated for the change in compatibility.