A default Ubuntu 13.04 installation comes with the unity graphical user interface. As with many things unity is not your only option for a graphical user interface. There are several other desktop environments available for Ubuntu 13.04 that you can download and install for use. This tutorial will show you how to install the GNOME 3 desktop environment on Ubuntu 13.04 also known as Gnobuntu.
Read moreHow to Install the GNOME 3 Desktop Environment in Ubuntu 13.04 (GNOME Shell)