Can't set synaptics "TapButton" options in 12.04 LTS

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http://askubuntu.com – I have recently upgraded my netbook from Ubuntu 11.04 to 12.04 LTS. Since the upgrade - in fact, possibly since the upgrade to 11.10 - the system no longer registers touchpad taps as mouse clicks (except, bizarrely enough, in a couple of very limited cases). This feature worked perfectly in 11.04, (and before that, in Eeebuntu based on Jaunty,) and I can't get used to working without it. Other advanced touchpad options, like two-finger scrolling, work perfectly. "Enable mouse clicks with touchpad" is enabled in System Settings. In the GPointing Device Settings GUI, tapping likewise appears e (HowTos)