Ubuntu 11.04 natty narwhal Gnome 3 as default (Howto remove Unity)

IMPORTANT!!! : GNOME 3 PPA is an experimental developer preview and is not recommended for install

if you dont want to install gnome3 (its unstable), please check howto disable unity and use gnome2 

Add the ppa sources of gnome3 for Ubuntu 11.04

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

select the GNOME 3 desktop at login prompt

1. At login screen type your user. You will see at the bottom of the screen some options like this screen shot
2. Choose Ubuntu Classic Desktop.
3. Login or Restart!

Optionally you can install

sudo apt-get purge gnome-accessibility-themes

sudo apt-get install gnome-themes

sudo apt-get install gnome-themes-standard

sudo apt-get install gnome-themes-extras

please comment if you have any problem! thanks!

If you have problems try ppa-purge

sudo apt-get install ppa-purge
sudo ppa-purge ppa:gnome3-team/gnome3