INSTALLING GNOME SHELL IN UBUNTU
Ubuntu has introduced unity as the desktop manager. But there are variety of options for desktop managers in Ubuntu. One of them is the gnome-shell.
GNOME Shell is the "official" shell developed for GNOME 3 by GNOME.
GNOME Shell provides core user interface functions for the GNOME 3
desktop, like switching to windows and launching applications. GNOME
Shell takes advantage of the capabilities of modern graphics hardware
and introduces innovative user interface concepts to provide a visually
attractive and easy to use experience.
Installing gnome-shell:In 11.10 onwards, GNOME Shell is installable from the official repositories.You can find it in the Ubuntu Software Center, or
to install from a terminal type
sudo apt-get install gnome-shell
Now you can try it by pressing ALT+F2 and entering gnome-shell --replace
INSTALLING XFCE IN UBUNTUXfce is a lightweight desktop environment for UNIX-like operating systems. It aims to be fast and low on system resources, while still being visually appealing and user friendly.
Ubuntu has a xfce spin called xubuntu. You can install it from software center or command-line.
sudo apt-get install xubuntu-desktop
Installing LXDE (Lightweight X11 Desktop Environment) in ubuntu
LXDE is an extremely light desktop environment that focuses on high performance and low resource usage. It is currently the default desktop environment used by Lubuntu
If you have regular Ubuntu installed, you can install it from the Software Center, just look for
lubuntu-desktopin it or install it from command-line:
sudo apt-get install lubuntu-desktop
Installing KDE in ubuntu
KDE is probably the second most well-known DE available after GNOME.
Kubuntu doesn't have the best reputation among KDE users, being regarded as slow and using more memory than needed (there are posts of people using KDE on Arch Linux taking less than 450MB).
Installing Cinnamon in ubuntu
Cinnamon is a Gnome-Shell desktop fork. It is not strictly a Gnome-2 interface, although the developers aims are laudable - to produce a simpler more traditional desktop interface.
From a terminal type the following:
sudo add-apt-repository ppa:gwendal-lebihan-dev/cinnamon-stable
sudo apt-get update
sudo apt-get install cinnamon