A lightweight interface for Ubuntu
Refer: https://www.lifewire.com/ubuntu-15-04-vs-xubuntu-15-04-2201174
$ sudo apt-get update
$ sudo apt-get install xfce4
Logout Change settings by gear next to logon, you might need to reboot, if you are using auto logon.
User Admin GUI is missing on XFCE, use the following to add it:
$ sudo apt install gnome-system-tools
Launch it like this:
users-admin