title: How to completely uninstall phusion passenger in Ubuntu 13.10, Apache2 combination?
body: <p>I installed the Phusion Passenger using the below commands </p>
  
  <pre><code>sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 561F9B9CAC40B2F7
  sudo apt-get install apt-transport-https ca-certificates
  </code></pre>
  
  <p>Then, because of some reason, I tried to uninstall Phusion Passenger by the following way,
  First: I removed the all Phusion Passenger configuration directives
  Than: <code>gem uninstall passenger</code></p>
  
  <pre><code>(results: gem "passenger" is not installed)
  </code></pre>
  
  <p>If I put "<code>passenger -v</code>". It returns </p>
  
  <pre><code>Phusion Passenger version 4.0.37
  "Phusion Passenger" is a trademark of Hongli Lai &amp; Ninh Bui.
  </code></pre>
  
  <p>Still it is not completely removed. I don't know how to proceed further.</p>
  
  <p>I want to completely remove the Phusion Passenger, and install the fresh copy. Please assist me to do this</p>