When we run integration tests for Bamboo we face very similar problem.
Our WebDriver tests are running in a real web browser that is crawling Bamboo UI. This is of course run on a headless machine.
In order to make this work we use xvfb tool which basically creates virtual display available for use for all X-Windows applications starting from simple ones as xterm ending on chrome or firefox. Xvfb is available as a package for all existing Linux distros, so there should no be problem with availability of this tool for your installation.
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