Can not remove images even though no container is running : <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>
