title: Android-sdk manager is not showing all Packages
body: <p>I have a problem , my android-sdk-manager is suddenly stopped showing all packages, it is only showing the installed packages only. Can you guys help me out how to solve this issue? </p>
  
  <p><a href="https://i.stack.imgur.com/SD9TX.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/SD9TX.png" alt="enter image description here"></a></p>