Like its bigger brother Ubuntu and other official flavors, Lubuntu is still using the old X.Org Server by default, though nothing stops users to switch to Wayland if they want a more secure and capable display server for their computers, but that’s about to change in the coming years as Lubuntu will adopt Wayland by default. Ubuntu already tried to move to Wayland by default with the now deprecated Ubuntu 17.10 (Artful Aardvark) release, but it had to switch back to X.Org Server and put Wayland on the back seat as an alternative session, which users can select from the login manager, with the Ubuntu 18.04 LTS (Bionic Beaver) release.