Could not launch emulator in Android Studio

Question

I tried to launch application in emulator in android Studio in ubuntu 14.04 and it shows the following errors.

1. Error shown while gradle build is in process:

Answer 1

It may be Android Emulator is not installed.

To add it to the Android Studio installation, go to Tools->Android->SDK Manager, select the SDK Tools tab, then ensure that Android Emulator is selected.