Si Steam l'indique, c'est que c'est sûrement vrai. D'ailleurs, en regardant les nouvelles ayant trait au jeu depuis Steam, on tombe là-dessus :
"Aspyr Media is pleased to announce our first Linux and SteamOS title, Sid Meier’s Civilization V. The SteamOS release includes all Civilization V DLC and expansion content, including Gods & Kings and Brave New World.
This release targets SteamOS on current gen hardware. Additionally, we're working towards supporting Ubuntu 14.04 as well as additional video cards in future updates.
Here’s where we need your help! To improve Civ V and future AAA games on SteamOS, we're looking for feedback. Tell us below what's working great or what's not working. If you're having any problems, please contact our support directly at http://support.aspyr.com/tickets/new"
http://steamcommunity.com/gid/103582791433255595/announcements/detail/1787114954235229948
En gros, ça fonctionne, reste des petits soucis. Ils travaillent à supporter la version Ubuntu 14.04 et des cartes graphiques.
Amicalement Tisoon