title: Fatal: The remote end hung up unexpectedly
body: <p>I am working through the <a href="http://try.github.com" rel="nofollow">"Try Git"</a> tutorial.</p>
  
  <p>When I get to the chapter "1.11 Pushing Remotely", and try to run:</p>
  
  <pre><code>$ git push -u orgin master
  </code></pre>
  
  <p>I get this error:</p>
  
  <pre><code>Permission denied (publickey).
  fatal: The remote end hung up unexpectedly
  </code></pre>
  
  <p>Any ideas?</p>