Install xserver-xorg-legacy by entering the following commands in the terminal:
sudo apt update sudo apt install xserver-xorg-legacy
Description:
setuid root Xorg server wrapper
This package provides a wrapper for the Xorg X server, which is necessary for legacy drivers and non-Linux kernels.
Homepage: https://www.x.org/
Version: 2:1.19.6-1ubuntu4
Section: x11