Desktop environments like Gnome assume the hardware on the machine they're running on is all the displays they'll ever have to deal with. "Headless" means there

Desktop environments like Gnome assume the hardware on the machine they're running on is all the displays they'll ever have to deal with. "Headless" means there is no display (the "head" of the computer) connected to the machine. This update allows Gnome to use virtual monitors.