Ubuntu 11.04 has not yet implemented the Gnome 3 interface, but the next version of Ubuntu, 11.10, will use Gnome 3.
Xubuntu and Ubuntu are two different versions of Ubuntu. (Ubuntu has GNOME.)
This worked for me with gnome under Ubuntu Gutsy: https://answers.launchpad.net/ubuntu/+source/gnome-panel/+question/1170
Gnome.
Ubuntu uses GNOME by default. However, a KDE version is available, named Kubuntu. It doesn't have all the bells and whistles of its GNOME counterpart
There are two main variants; the desktop and server editions. There are also other projects that use the Ubuntu base to provide other features or services:Ubuntu Education Edition - Formerly known as Edubuntu, is targeted at schools and children.Kubuntu - Uses KDE instead of GNOME as its desktop environment.Xubuntu - Uses Xfce instead of GNOME as its desktop environment.Gobuntu - Removes all proprietary software and firmware from the distribution.
Gnome There is a KDE version named Kubuntu, however
This is generally a matter of preference based on what user interface you prefer (KDE in Kubuntu, or GNOME in Ubuntu). They are both produced by the same company, although some believe the Ubuntu distribution receives more attention and polish.
Gnome. If you want KDE, you can use Kubuntu, the KDE derivative of Ubuntu.
GNOME Disk Usage Analyzer
GNOME X server bash shell for terminal And many other.
press ALT+F2 and type "gnome-terminal" without the quotes or go to Applications->Accesories->Terminal. Gud Luck with using Ubuntu.