FYI, the Xvfb plugin page on the jenkins site has this which leads users in the wrong direction:
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Usage
The plugin starts and stops the Xvfb virtual framebuffer X11 server so your jobs can use X11 displays in headless environments such as servers, or when dedicated X11 display is required for each job.
Start by going to Manage Jenkins / Configure System and setup your Xvfb installation. You need to give it a arbitrary name like default Xvfb and directory in which the Xvfb executable is located like /usr/X11R6/bin. Unfortunately there is no support for automatic installation of Xvfb. As of version 1.1.0 you can define a single Xvfb tool installation or have a installation named "default" and the jobs are going to run even if you don't define what installation to use in the job configuration.
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This is a Major issue for us because we use it to perform Selenium tests. Please provide an ETA if possible.
Thanks