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Xvfb

Xvfb or X virtual framebuffer is a display server implementing the X11 display server protocol. In contrast to other display servers, Xvfb performs all graphical operations in virtual memory without showing any screen output. It is commonly used for running graphical applications in environments where no physical display is available, such as on headless servers or in continuous integration systems; and Euler has no physical display attached to it.

Xvfb on Euler

Xvfb is available on Euler and can be used by prefixing your command with xvfb-run. This will start a virtual X server and run your command in that environment.