I don't currently have access to a Linux machine, so I was hoping Unity's Linux build would work without any fiddling on my part. I'll try to get my colleague at work to run it for me to see if I can reproduce the issue and let you know if I can find a fix.
May I ask what version of Linux you are running on and what graphics card you've got in there?
My colleague had a very different problem (game wouldn't even start for him), so I think I'm rather going to pull the Linux version for now until I get time to setup a test machine where I can troubleshoot.
