Hi Chris, I've answered on stackoverflow, pasted here for others to find as well:
Use this script in `init.groovy.d` directory:
import jenkins.model.Jenkins
import org.jenkinsci.plugins.xvfb.*
def installation = new XvfbInstallation('default', '/usr/local/bin', null)
Jenkins.getInstance()
.getDescriptorByType(Xvfb.XvfbBuildWrapperDescriptor.class)
.setInstallations(installation)
The `default` is the name of the Xvfb installation, and `/usr/local/bin` is the directory where Xvfb binary resides, change accordingly.
Should this be an issue for DSL Plugin or xvfb Plugin?