Cannot start Emulator in android studio 2.0

Question

I just upgraded my android studio from 1.5 to 2.0.And now I am facing some weird bug when I try to start Emulator. I use Ubuntu 15.10 OS

Android monitor returns this

Answer 1

All of the above answers did not work for me as "Android Emulator" was not installed with standard installation of Android Studio. Make sure you have installed it and then try above answers.