I suspect you don't have a PolicyKit authentication agent running. What's the 
output of:
ps ax|grep polkit

And does running /usr/lib/policykit-1-gnome/polkit-gnome-authentication-
agent-1 solve the problem?

The fact that nor error is reported is another issue, but I don't think
it will be fixed because users-admin is going to be replaced soon.

** Changed in: gnome-system-tools (Ubuntu)
       Status: New => Incomplete

** Changed in: gnome-system-tools (Ubuntu)
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/740312

Title:
  Ignores presses of "Add" and "Advanced Settings"

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