title: Update Jenkins from a war file
body: <p>I have a machine with Ubuntu 12.04 and have installed Jenkins ver. 1.424.6 using apt-get based on *<a href="http://www.mabishu.com/blog/2012/04/17/setting-up-jenkins-in-ubuntu-precise-12-04-for-php-projects/" rel="nofollow noreferrer">this guide*</a>, but there is a new version:</p>
  <pre><code>New version of Jenkins (1.447.2) is available for download (changelog).
  </code></pre>
  <p>If I press download, I get a <code>jenkins.war</code> file... but how do I use that for upgrading my current installation? or is that not possible before the apt repositories gets updated?</p>