How to Install the Desktop Components (GUI) For Ubuntu

Unity (The Default Desktop)

sudo apt-get install ubuntu-desktop

KDE

sudo apt-get install kubuntu-desktop

LXDE (Lubuntu)

sudo apt-get install lubuntu-desktop

MATE

sudo apt-get install mate-desktop

Gnome

sudo apt-get install ubuntu-gnome-desktop

XFCE (Xubuntu)

sudo apt-get install xubuntu-desktop