On some versions of Ubuntu (or Linux in general) you may need to install the following dependencies in order to play the game:

libcurl4
libopenal1

You might also need to check "Allow executing file as program" under the game's Permissions (in the executable's Properties) in order to launch it.

Additionally, the game may not work on certain Linux versions and distros. There is little I can do about this, so please understand that.