Ubuntu 11.10 Oneiric Ocelot comes with Unity preinstalled. Unity is a shell interface for the Gnome Desktop Environment developed by Canonical for its Ubuntu Operating System. On Ubuntu 11.10 it's pretty easy to install Gnome Shell and Gnome Shell classic, the one with the two panels on top and at the bottom. Here is how.
To install Gnome Shell (3.2 is the latest version at the moment) open Software Center and search for gnome shell or open a terminal and type:
sudo apt-get install gnome-shell
Now logout and select GNOME from the LightDM login screen. Here is how it looks like:
To install Gnome Fallabck (3.2 is the latest version at the moment) open Software Center and search for gnome session fallback or open a terminal and type:
sudo apt-get install gnome-session-fallback
Now logout and select GNOME Classic from the LightDM login screen. Here is how it looks like:
Here is a screenshot with the options on the mogin manager. These packages might already be installed on your system, so take a look first.
So, which is your favorite desktop environment? Unity, Gnome or something else? Personally I am using KDE for many years now and despite Canonical's ang GNOME's team efforts I am not going to change!