[ Thanks to Linux User &
Developer magazine for this link. ]
“When installing Lubuntu 11.04, the differences with its
official Ubuntu cousin are negligible. It shows the same boot menu
and the same installer, just with a different background colour.
However, from the moment you start working with the desktop in the
live environment or the installed version, the difference is
immediately clear: this is not a fully fledged GNOME or Unity
desktop with bells and whistles, but a classic, lightweight
desktop.“The use of LXDE is not the only cause either. Lubuntu also
starts less daemons and services than Ubuntu by default, as you can
see in the process list as well as in the menu
(Preferences>Desktop Session Settings -> Automatically
Started Applications). For instance, Bluetooth Manager, Network
Manager, the print queue applet and disk notifications are all
disabled by default in your user session.”