title: Docker rmi unable to remove images
body: <p>So , I have a bunch of untagged images on my host. I use </p>
  
  <p><code>sudo docker rmi $(sudo docker images | grep "&lt;none&gt;" | awk '{print($3)}')</code>
  to delete these images. On execution , I get error </p>
  
  <blockquote>
    <p>Error response from daemon: Conflict, cannot delete 31fa814ba25a
    because the container 70c20aa2c19f is using it, use -f to force</p>
  </blockquote>
  
  <p>So I do a </p>
  
  <pre><code>sudo docker rmi 70c20aa2c19f
  </code></pre>
  
  <p>on which I get the error </p>
  
  <blockquote>
    <p>Error response from daemon: No such image: 70c20aa2c19f</p>
  </blockquote>
  
  <p>So if there's no image with ImageID 70c20aa2c19f , then why the initial delete command's error states that there is an image with ImageID 70c20aa2c19f ?</p>