After updating to Android Studio 2 when I try to run my application and choose an emulator, I wait for the emulator to start and it suddenly gets killed. I can see emulator
In my case, the problem was resolved after I tried a lower version of Pixel and Android.
Just restarting the pc and studio solved my problem!
For me, just deleting ANDROID_SDK_HOME from the environment variable list solved the problem
I had same issue, the problem was there is no enough space in my disk drive.. you can see details about you specific situation in layer 'Event Log' this layer regularly is in the bottom on Android studio, it was my output Log:
"02:45 PM Emulator: emulator: ERROR: Not enough space to create userdata partition. Available: 3310.363281 MB at /home/user/.android/avd/my_Nexus_5X_API_27.avd, need 7372.800000 MB."
I had just 7 GB free, so just delete some GB's in my D.D. and it's working fine.
For me it was a problem of available space left in my computer and deleting unnecessary files solved the problem. Causes are vary from situations and you should see event tab which detailed event log are showed.
I hit this issue trying to run Android API 30. In the end, I had to upgrade Android Emulator to 30.1.5
(it was 30.1.2
before this).