This article will explain how to install Xubuntu desktop on Ubuntu 18.04 Bionic Beaver. Use this guide if you wish to change your default GNOME desktop to Xubuntu environment.
This is a companion discussion topic for the original entry at https://linuxconfig.org/how-to-install-xubuntu-desktop-on-ubuntu-18-04-bionic-beaver-linux
What is the advantage of using tasksel please, instead of just apt?
tasksel is a meta installer that installs related packages.