title: Ubuntu 12.04 stuck on "checking for running unattended upgrades" message while restarting
body: <p>I'm running Ubuntu 12.04 on my computer, my hard disk is shared by another thin client terminal. <br />
  When I try to shut-down or restart my computer I get a black screen with the words <code>halted</code> and nothing else happens.</p>
  <p>This is the screen I get:</p>
  <p><a href="https://i.stack.imgur.com/g4jGN.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/g4jGN.jpg" alt="Error Message" /></a></p>
  <p>Thank you in advance.</p>