title: Sorry, user "user" is not allowed to execute '/usr/bin/apt-get update' as root on
body: <p>I've installed Debian 7 and just executed <code>sudo apt-get update</code> and got this error: </p>
  
  <pre><code>Sorry, user xsma is not allowed to execute '/usr/bin/apt-get update' as root on ACS.ACS
  </code></pre>
  
  <p>my user is "xsma" and  "ACS" is the name of the computer.</p>