title: Can't change emulated performance of AVD in Android Studio
body: <p>I can't change the graphics to software as I'm sure this is the fix for my AVD not launching. 
  The option is greyed out (see screenshot). Has anyone has experience with this? I couldn't find anyone who had the same issue.</p>
  
  <p>I'm running the latest version of Android Studio on Ubuntu 17.04.</p>
  
  <p><a href="https://i.stack.imgur.com/Vzv1W.png" rel="noreferrer"><img src="https://i.stack.imgur.com/Vzv1W.png" alt="Screenshot of the configuration of the AVD"></a></p>