I'm on a Ubuntu 14.04 LTS computer and I have installed Civilization 5 from Steam. Whenever I click the "close game" option from inside the game's menu, all the graphics and any icons on the task bar disappear, but I am left with the background sound from my game (birds chirping, water rushing, etc.), though no music ever plays.
I have tried closing the lid of my laptop, and this only gets rid of it if the computer goes on sleep (which takes about 10 minutes), and I don't want to have to do that every time I stop playing. Shutting down also works, but again, I don't want to do this, as I still want to use my computer afterwards.
Any idea how to fix it?