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I finally figured this out and for me the answer was simple. Go to ~/.config/unity3d/ and rename voxGames to VoxGames. I don't know what happened but I know that directories are case sensitive in Ubuntu.

Good catch!
File and directory names are case sensitive on Linux in general, so if this helped it's a simple typo that the dev didn't notice on Windows (because that's not case sensitive for the most part).