Those settings look okay.
When the screensaver doesn't come up, is the "gnome-screensaver" process
still running? Can you start it by hitting Ctrl-Alt-L?
When this happens, do you have a context menu open, or an application
such as VNC or Virtualbox?
** Changed in: gnome-screensaver (Ubuntu)
Status: New => Incomplete
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the screen saver never starts
https://bugs.launchpad.net/bugs/516094
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