How to install a Graphical Desktop Environment on Ubuntu or Debian server

As you know, the Ubuntu Desktop variant ships with the default GNOME desktop environment for users, so why do we need to install a graphical desktop environment on Ubuntu? Yes, it is shipped with the GNOME desktop environment to use, but it is not always like that. If you have installed the Ubuntu server or Debian minimal, then you won’t find the regular desktop setup to use your favourite application graphically.