LXDE, which stands for Light X11 Desktop Environment, is a very light weight desktop environment for Linux.
The installation process is rather easy for LXDE because it is already included in Ubuntu Software Repository.
There are two versions of LXDE available: LXDE Core and LXDE Full. You can find both versions in Ubuntu Software Center.
LXDE Core installs only the core modules for running LXDE, whereas LXDE Desktop installs all the applications bundled with it. Click here for the list of applications included in the Full version.
To install LXDE Core using command line:
sudo apt-get install lxde-core
To install LXDE Full:
sudo apt-get install lxde
Restart Ubuntu and you can choose to log in to LXDE at login-screen.
