Hi, can you please provide more information? What version of Ubuntu are you using? (I have only tested on 12.04 LTS.) Are you having trouble unpacking the .tar.gz file or running the executable inside?
On Ubuntu, you should be able to right-click the .tar.gz file and choose “Extract Here,” then navigate to the new folder and run the Launch.sh script.
You should also be able to install and launch the game through the itch.io desktop app, although I have not tested it on Linux yet.