Install xorg-server-source by entering the following commands in the terminal:
sudo apt update sudo apt install xorg-server-source
Description:
Xorg X server - source files
This package provides original Debian (with Debian patches already applied, and autotools files updated) sources for the X.Org ('Xorg') X server shipped in a tarball. This enables other projects re-using X server codebase (e.g. VNC servers) to (re-)use officially Debian-supported version of the X xserver for their builds. . Unless you are building a software product using X server sources, you probably want xserver-xorg and/or xserver-xorg-core instead.
Homepage: https://www.x.org/
Version: 2:1.19.6-1ubuntu4
Section: universe/x11