title: docker: official ubuntu 14.04 image
body: <p>I try to find the official Ubuntu 14.04 image:</p>
  
  <pre><code>docker search ubuntu | grep -i offi
  </code></pre>
  
  <p>But I only find this image, which I would trust:</p>
  
  <pre><code>ubuntu    Official Ubuntu base image
  </code></pre>
  
  <p>The other images are from unknown sources (like foouser/ubuntu...) , and I don't trust these sources.</p>