title: Can not remove images even though no container is running
body: <p>I had multiple stopped containers and images in my machine.<br>
  I wanted to clean up and removed all containers:<br>
  <code>docker ps -a</code> returns nothing.<br>
  I run <code>docker rmi $(docker images -q)</code> to remove the cached images but I get:  </p>
  
  <blockquote>
    <p>Error response from daemon: conflict: unable to delete ...
    (must be forced) - image is referenced in multiple repositories  </p>
  </blockquote>
  
  <p>What repositories is it talking about?  </p>