25 days ago - AndrewT - Direct link
File Locations on Linux

Executable, DLCs and Mod upload folder:
/home/user/.local/share/SteamApps/common/Crusader Kings III/

The "Documents" equivalent is:
/home/user/.paradoxinteractive/Crusader Kings III/

So logs are in /logs/ under that.

Is your crash as our launcher starts or as the game starts from it?

Has it ever worked on this machine?

What happens if you start the game's executable from a terminal session command line?  
24 days ago - AndrewT - Direct link
There's a bug in the 1.1.x patches where it will not load on a machine with only 2 CPUs, which is the case here. I've only seen it on Windows so far so I'm not 100% sure that is your problem.

So please try reverting to the 1.03 game patch in the Steam Betas tab for the game - is that any better?  
22 days ago - AndrewT - Direct link
Great, thanks for that detail!  
19 days ago - AndrewT - Direct link
Not that I can disclose as yet, I'm sorry!

But can you not revert to game version 1.03 and play, as with this issue on Windows?