Install xserver-xorg-core by entering the following commands in the terminal:
sudo apt update sudo apt install xserver-xorg-core
Description:
Xorg X server - core server
The Xorg X server is an X server for several architectures and operating systems, which is derived from the XFree86 4.x series of X servers. . The Xorg server supports most modern graphics hardware from most vendors, and supersedes all XFree86 X servers. . More information about X.Org can be found at:
Homepage: https://www.x.org/
Version: 2:1.19.6-1ubuntu4
Section: x11