This is because xubuntu uses the gnome screensaver. A workaround would
be to edit /usr/bin/xflock4 to make it use the gnome screensaver (I have
no idea about the command you need though).
** Changed in: xfce4-utils (Ubuntu)
Status: New => Triaged
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Xubuntu 7.10: command "xflock4" fails
https://bugs.launchpad.net/bugs/183480
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