How to Install extra screensavers with XScreensaver in Ubuntu 10.04 LTS "Lucid Lynx"

XScreenSaver is a modular screen saver and locker for X11 containing more than 200 screen savers.  This package is used by both xscreensaver and gnome-screensaver.

To install XScreensaver open  Synaptic Package Manager  and type xscreensaver in the search field. Mark xscreensaver, xscreensaver-gl-extra and xscreensaver-data-extra for installation and click on the Apply button.

or

$sudo apt-get install xscreensaver