Hmmm...
I've done a fair bit of digging. A brief summary of what I've found:
1) It is apparently not uncommon for some versions of Linux and Unity games to simply not get along.
Part of what has made it difficult to research this problem is that there an awful lot of problems that come up when researching.
2) Based on the log and research based on the contents, my best guess is that something is going wrong with OpenGL.
3) However, since it seems to indicate you have the correct version installed, I'm not sure what to do about that...
I did find there is a way to force Unity to use different drivers, so let's try that.
Apparently if you run the game with the following command line options, you may get different results:
-force-opengl
-force-glcoreXY (where XY can be 32, 33, 40, 41, 42, 43, 44, or 45.)
My recommendation would be to try three in this order:
-force-glcore32
-force-opengl
-force-glcore45
Though... oddly, while some of the Google research (
https://bugs.freedesktop.org/show_bug.cgi?id=96396) says these will work in Linux, Unity's own manual says they're Windows only. Well, if they really are Windows only, it will be a quick test.
Anyway, please continue using the version I sent, and copy out the logs for each of the three runs. You can use whichever of the 32 or 64 bit versions you prefer, based on the log, both are hitting the same problem anyway, just after different amounts of time.
I should stress again, with apologies, that this is guesswork. I wish I could be more certain of answers, but we're pretty deep in the weeds here in an OS I don't know much about.
Good luck, and thank you for your patience and willingness to help out.