title: Unable to chown although user exists
body: <p>I am unable to "<code>chown</code>" to username from UID. </p>
  
  <p>For example: </p>
  
  <pre><code>123456789 123456789 jdoe
  --------------------------------------
  
  chown jdoe:jdoe jdoe 
  </code></pre>
  
  <p>I get:</p>
  
  <blockquote>
    <p><code>chown:invalid jdoe 'jdoe:jdoe'</code></p>
  </blockquote>
  
  <p>but '<code>jdoe</code>' exists. </p>