Confirming this affects Xubuntu but not Ubuntu. The cause appears to be
a reliance on gnome session manager to trigger the restart:

UpdateManager/UpdateManager.py::592


  def show_reboot_required_dialog(self):
    self.dialog_reboot.set_transient_for(self.window_main)
    self.dialog_reboot.set_title("")
    res = self.dialog_reboot.run()
    self.dialog_reboot.hide()
    if res == gtk.RESPONSE_OK:
      try:
          bus = dbus.SessionBus()
          proxy_obj = bus.get_object("org.gnome.SessionManager",
                                     "/org/gnome/SessionManager")
          iface = dbus.Interface(proxy_obj, "org.gnome.SessionManager")
          iface.RequestReboot()
          # FIXME: try sesion restart with hal?
      except dbus.DBusException, e:
          pass

-- 
On Clean install after update restart didnt work.
https://bugs.launchpad.net/bugs/530161
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