Maybe try and remove the "- Linux" for the "WalkingTankWarrior - Linux" folder name... It says it cant find something and that is the only thing I changed! Just sorry about it not working I have not been able to test the Linux version myself sadly I may just remove it if there is issues
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Ah dam sorry about that I have just disabled the download for it now!
A forum in google with the same error lists
"For those looking for an answer, try specify opengl version when running your game, my situation here is adding “-opengl4” and finally got it ticked." Maybe see if that works?
also saw using "-gpus all" can help with nvidia cards!