Croteam, the Croatian-based game development studio behind the Serious Sam series, proudly posted a couple of days ago, July 18th, on their Facebook page, a screenshot of Serious Sam 3 running on Ubuntu Linux distribution.

There are no other details, besides the screenshot (click it above to enlarge) posted on Facebook by Croteam. Apparently the game was ported to the Linux platform and tested on the Ubuntu operating system.