title: Fixing "An error has occurred and the system can't recover. Please log out and try again."
body: <p>I was playing around with the System Settings, and I foolishly increased the Zoom to 10.0 (normal being 1.0), after which the system crashed with an error saying:</p>
  
  <blockquote>
    <p>A problem has occurred and the system can't recover. Please log out and try again.</p>
  </blockquote>
  
  <p>How can I use the terminal to change the zoom settings back to normal?</p>