By default, xfce screensaver requires xscreensaver. You have the _option_ to remove xscreensaver using the following command (as privileged):
apt-get remove xscreensaver
To install the gnome-screensaver use the following command (as privileged):
apt-get install gnome-screensaver
To auto-start the gnome-screensaver, add it as an Autostarted Application:
Xfce menu > Settings > Autostarted Applications
The command for starting the gnome-screensaver daemon is:
To be able to use the action button "Lock screen" to start gnome-screensaver immediately and lock your screen, modify the file /usr/bin/xflock4:
#xscreensaver-command -lock || xlock $*
gnome-screensaver-command --lock exit 0
Note that the original xscreensaver command is now commented. Backup the original copy of xflock4 (as privileged):
cp /usr/bin/xflock4 /usr/bin/xflock4.orig
Hope that helps.
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