If you find yourself wanting a desktop environment after you have installed Ubuntu server you can easily add it. Pick your favorite desktop environment from the list below and run the associated command. Remember that installation software requires root privileges so use “sudo” or switch to the root user before you begin the installation.
Unity (The Default Desktop)
sudo apt-get install ubuntu-desktop
NOTE: If you’re using Ubuntu 16.04 or higher, you can use the “apt” command instead of “apt-get”:
sudo apt install ubuntu-desktop
KDE
If you’re using Ubuntu 16.04 or higher, you’ll need to add the PPA for KDE first:
sudo add-apt-repository ppa:kubuntu-ppa/backports
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