Binary package “xscreensaver” in ubuntu xenial

Screensaver daemon and frontend for X11

 XScreenSaver is a modular screen saver and locker for X11,
 containing more than 200 screen savers.
 This package includes the bare minimum needed to blank and lock
 your screen. Install this package if you prefer xscreensaver to
 gnome-screensaver. If you prefer gnome-screensaver, you don't
 need to install this package.
 The graphical display modes are in the xscreensaver-data,
 xscreensaver-data-extra, xscreensaver-gl and xscreensaver-gl-extra