I just bought the game.
It does not launch whereas i don't have issue with all other games.
Using kubuntu 15.10 on msi gt70 2pc. I tried using intel graphic and nvidia prop drivers (the very lastest ones).
And the game is stuck at loading, i could not start even the first mission.
I have the graphic drivers ppa.
The first campaign mission is loading on infinite loop.
http://paste.ubuntu.com/13525434/
$ glxinfo | grep "OpenGL version"
OpenGL version string: 3.0 Mesa 11.2.0-devel (git-27a88a9 2015-11-27 wily-oibaf-ppa)
$ primusrun glxinfo | grep "OpenGL version"
OpenGL version string: 4.5.0 NVIDIA 358.16
I tried various prefixes and launch options through steam without success.