title: How to restore the toolbar in the left side of ubuntu unity?
body: <p>I used the following command on the terminal of ubuntu by accident and now I can't see the toolbar in the left side of ubuntu unity anymore, any one can help ?</p>
  
  <p><strong>setsid unity</strong></p>
  
  <p>Now I cannot even see when I swtich between applications by using alt+tab (alt+tab works but I cannot see it). So how to resolve the problem ?</p>