Installing GNOME 3 on Ubuntu 11.04

Open Terminal ( Default shortcut is : CTRL+ALT+T ) and Type the following commands (Make sure that you haven’t opened Ubuntu Software Center or Synaptic Package Manager while installing package from the command line).
Update 1 : (I forgot to include the warning message regarding the Gnome 3 installation).
Warning : Installing Gnome 3.0 on Ubuntu 11.04 using this PPA, will break Unity and your system might become unusable.

sudo add-apt-repository ppa:gnome3-team/gnome3
sudo apt-get update
sudo apt-get dist-upgrade
sudo apt-get install gnome-shell

Then Restart your computer; select the GNOME 3 desktop at login prompt (Default is Ubuntu, which means Unity).

Update 2 :

How to Remove/uninstall Gnome 3 from Ubuntu 11.04

Type this simple command at terminal if you want to roll back to previous state..

 

sudo ppa-purge ppa:gnome3-team/gnome3

Credit to http://blog.sudobits.com/2011/04/26/how-to-install-gnome-3-on-ubuntu-11-04/