Crash on startup on Linux with fglrx drivers.
There is, and has been for some time, a crash on startup with the fglrx proprietary Radeon drivers for Linux.

This occures the second time the game is run, but not the first.

The workaround is to remove the graphics quality line from the Unity3D prefs file for Unturned at
~/.config/Unity3D/Smartly Dressed Games/Unturned 3/prefs

Then mark the file read-only.
This forces graphic settings to be auto-detected every time, apparently working around the bug.

I would be able to trace the problem further if the graphics settings were placed individually in the config file instead of using the quality shortcut. I believe Unity can do this, but it has to be force-enabled.

I will post a pastbin of the log, but suffice to say it causes a segfault in native code on the thread that is initializing the graphics. I'm not sure if any more information is helpful beyond that.