Install xorg by entering the following commands in the terminal:
sudo apt update sudo apt install xorg
Description:
X.Org X Window System
This metapackage provides the components for a standalone workstation running the X Window System. It provides the X libraries, an X server, a set of fonts, and a group of basic X clients and utilities. . Higher level metapackages, such as those for desktop environments, can depend on this package and simplify their dependencies. . It should be noted that a package providing x-window-manager should also be installed to ensure a comfortable X experience.
Homepage: http://www.x.org/
Version: 1:7.7+19ubuntu7
Section: x11