title: “waiting for target device to come online” Ubuntu 16.04
body: <p><a href="https://i.stack.imgur.com/hvMzP.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/hvMzP.png" alt="enter image description here"></a></p>
  
  <p>And later nothing happens. anyone idea?
  <a href="https://i.stack.imgur.com/HY7yP.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/HY7yP.png" alt="enter image description here"></a></p>
  
  <p>Error while waiting for device: Timed out after 300seconds waiting for emulator to come online.</p>