This is the snap for Xonotic. It works on Ubuntu, Fedora, Debian, and other major Linux distributions.
Published for 
snap install xonotic
snap connect xonotic:joystick
Xonotic is an addictive, arena-style first person shooter with crisp movement and a wide array of weapons. It combines intuitive mechanics with in-your-face action to elevate your heart rate. Xonotic is and will always be free-to-play.