Related: Install X11 server for GUI programs in Windows Subsystem for Linux.
Have you ever needed to have non-visible X11 graphical windows on a system that otherwise doesn’t have X11 running? X server virtual framebuffer (Xvfb) allows creating non-visible desktop windows (say, Python Matplotlib figures) without having an actual X11 server.
apt install xvfb
Xvfb :99 & export DISPLAY=:99
Open a new Terminal