sudo apt-get install xscreensaver xscreensaver-gl xscreensaver-gl-extra xscreensaver-data xscreensaver-data-extra 

setelah selesai lanjutkan tulisan berikut :

    sudo apt-get remove gnome-screensaver

bisa dilihat di http://crunchbanglinux.org/wiki/howto/install_xscreensaver