I am running the game on Ubuntu via NTFS drive.
The Ubuntu installation itself is nothing unusual, it may have been upgraded from 14.04 to 16.04, but I frankly do not remember.
I tried running the game multiple ways -> double click in file manager, ./start.sh in terminal, via referenced game in Steam, running the binary file itself, ... nothing worked for ext4
tried multiple ext4 drives, drives are mounted by OS, no custom mounting
I ran a strace on it, if it helps -> strace -s 64 ./start.sh
https://justpaste.it/3cht1