After updating Android Studio to 2.0 l am getting this error unable to obtain debug bridge and Android Device Monitor does
Check whether you need to install "Android Sdk Platform Tools" in the Android SDK Manager.
Somehow, after installing Android Studio from the bundle (for Linux) I lacked the "platform-tools" directory in "Android/Sdk", where the adb executable resides. Installing the platform tools helped. It was easier to find in the standalone sdk manager.