I've updated the Linux build to be inline with the newest Windows build.
It is important to note that - depending on the version of Ubuntu you have - additional dependencies may need to be installed to permit you to play the game. The dependencies are:
libcurl4
libopenal1
You should install these packages on your machine otherwise the games might not run.
Try this in the terminal:
sudo apt update
sudo apt-get install libcurl4
sudo apt-get install libopenal1