title: Jenkins, xvfb and selenium
body: <p>I have been attempting to follow the instructions here to get the Xvfb plugin running:
  <a href="https://wiki.jenkins-ci.org/display/JENKINS/Xvfb+Plugin" rel="noreferrer">https://wiki.jenkins-ci.org/display/JENKINS/Xvfb+Plugin</a></p>
  
  <p>Currently the xvfb executable is at <code>/usr/bin/Xvfb</code>.</p>
  
  <p>My project configuration and Jenkins config are identical to the instructions, however i am getting this error:</p>
  
  <blockquote>
    <p>ERROR: No Xvfb installations defined, please define one in the configuration. Once defined you''ll need to choose one under Advanced options for Xvfb plugin job settings and save job configuration.</p>
  </blockquote>
  
  <p>I have also tried putting the path to the executable in the Jenkins config, with had no change on the outcome.</p>
  
  <p>Any ideas how I can get this working?</p>