I use Android Studio 3.0.1 on Ubuntu 16.04.
Yesterday, Android Studio popped up a message saying that there\'s an update available, and I always click those. It the
This is what worked for me:
I have gone to Tools->AVD Manager->Edit(The particular emulator)>Show Advanced Settings
Then in the Emulated Performance section i had the Quick Boot selected, which i changed to Cold Boot and everything started working fine.
Hope this helps.