I have recently migrated from Windows 7 to Ubuntu 14.04 LTS. Everything works perfectly except for some things. I have successfully installed the two games I play often on Windows. Call of Duty World at War, and NBA 2k14. Both games run perfectly on Wine/PlayonLinux. Gameplay is terrific just like on native Windows. The only problem I encountered was there is no audio coming out from the game. My speakers do work however, outside of the game/s, when using YouTube or listening to music. I hypothesised that the problem was that there is no DirectX11 on my system. Could this be the cause of my problem? If not, what could it be? And how do I fix it?