In the third part, we make the system actually usable: we set up a proper desktop environment and ensure the user can administer the machine without living as root.
We install GNOME as the main desktop, and during the process we disable lxdm to prevent a different display manager from interfering with the graphical login and session startup.
Next, we configure clean administrative access for the user prueba. We add the user to the admin group:
usermod -aG wheel prueba
Then we safely edit the sudoers file using:
EDITOR=nano visudo
and we uncomment the rule:
%wheel ALL=(ALL:ALL) ALL
With that in place, prueba (as a member of wheel) can run commands with sudo and elevate to root only when needed—keeping the workflow clean and the system more secure.
