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Ubuntu 18.04.1 64 bit

I have a touchpad that is split at the bottom for right and left clicks. The sides are not separate buttons. When I boot Windows, depressing the bottom-right corner produces that standard right-click effect: a menu appears. Like others, I found that this feature had been turned off with Ubuntu 18.04, but, unlike others, I have been unable to turn it back on.

I installed Gnome Tweaks and set "mouse click emulation" to "area". This made the two-finger tap gesture stop working but did not make clicking the lower right bring up a menu. Tapping the bottom right corner works the same as a tap anywhere else on the touchpad, but depressing the bottom right corner to where it clicks produces no effect.

Synaptics does not seem to be in use. xinput list gives

⎡ Virtual core pointer                id=2  [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer      id=4  [slave  pointer  (2)]
⎜   ↳ ETPS/2 Elantech Touchpad        id=12 [slave  pointer  (2)]

xinput list-props 12 gives a bunch of libinput rules but does not mention Synaptics (why I think it is not being used). This way of determining the touchpad driver came from here. When I look at "Additional Drivers" in "Software & Updates", I see "No proprietary drivers are in use".

However, when I look in /usr/share/X11/xorg.conf.d, there are two Synaptics files. I tried renaming these files so that their numbers were lower than the libinput numbers so that I now have the files

50-synaptics.conf
51-synaptics-quirks.conf
90-libinput.conf
91-libinput-quirks.conf

Would deleting these Synaptics files or uninstalling Synaptics help? What else could be causing this?

Note that 91-libinput-quirks.conf contains code taken from here to make the two-finger tap work even when Tweaks has the input set to "area" (but the Tweaks setting did not work even before I created this file, so this cannot be the reason it does not work). Note also that some people have been reporting that setting "mouse click emulation" to "area" allows for both two-finger tap and bottom-right click while other people are reporting that they can only toggle between the two, so I am not sure whether this file is even supposed to be needed, but that is likely a separate issue.

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