测试环境：virtual box 虚拟机 - ubuntu 12.04 32bit
VirtualBox:~$ apt-cache search xscreensaver
xscreensaver - Automatic screensaver for X
xscreensaver-data - data files to be shared among screensaver frontends
xscreensaver-gl - GL(Mesa) screen hacks for xscreensaver
electricsheep - screensaver showing collective dream of sleeping computers
gkrellshoot - Plugin for gkrellm to lock the screen and make screenshots
kdm-gdmcompat - Provide basic gdm functionality to systems running kdm
kscreensaver - Additional screensavers for KScreenSaver
kscreensaver-xsavers - xscreensaver support for KScreenSaver
kscreensaver-xsavers-extra - universe xscreensaver support
libopengl-xscreensaver-perl - Perl module for writing OpenGL-based XScreenSaver hacks
rss-glx - Really Slick Screensavers GLX Port
unicode-screensaver - screensaver displaying unicode characters
wmmatrix - View The Matrix in a Window Maker dock application
xscreensaver-data-extra - data files to be shared among screensaver frontends
xscreensaver-gl-extra - GL(Mesa) screen hacks for xscreensaver
xscreensaver-screensaver-bsod - BSOD hack from XScreenSaver
xscreensaver-screensaver-dizzy - Graphics demo that makes you dizzy (XScreenSaver hack)
xscreensaver-screensaver-webcollage - Webcollage hack from XScreenSaver
lxde-core - Meta-package for the Lightweight X11 Desktop Environment Core
然后用 apt-get install 安装以下软件包：
xscreensaver
xscreensaver-data
xscreensaver-gl
xscreensaver-data-extra
xscreensaver-gl-extra
然后在应用中心找到屏幕保护程序，