title: Changing ownership of ‘/usr/bin/’: Operation not permitted
body: <p>I have just made a huge mistake by changing the owner of my <code>/usr/bin</code> from <code>root</code> to an ordinary <code>user</code>. Whenever i try to execute <code>$sudo chown root /usr/bin</code> this gives me :</p>
  
  <pre><code>chown: changing ownership of ‘/usr/bin/’: Operation not permitted
  </code></pre>
  
  <p>I have read many topics talking about this issue, which most of them give a solution in case you have already a backup image of your OS. Unfortunately I don't have any backup. Is there any solution then other than reinstalling Ubuntu from scratch.</p>