After some additional troubleshooting, I've decided this is reported to the wrong package. Switching that.
The fix for me here was to set:
$ gsettings set org.gnome.desktop.peripherals.touchpad click-method areas
It appears that libinput defaulted my computer on reinstall of Ubuntu to the Apple/Mac style 1-2-3 finger alt-clicking. I think that is a great default *for Apple computers*, but a poor one for devices like this Dell where the traditional behavior is that of a 'clickpad', i.e., where you right+click by physically clicking on the bottom right of the touchpad.
My suggested fix would be to detect the appropriate vendor and change click-method accordingly (Dell/Lenovo/Other->"areas"; Apple->"fingers").
Otherwise, we need to train users what to do, because this is *entirely unexpected* behavior from anyone who doesn't use a Mac computer.
After some additional troubleshooting, I've decided this is reported to the wrong package. Switching that.
The fix for me here was to set:
$ gsettings set org.gnome. desktop. peripherals. touchpad click-method areas
It appears that libinput defaulted my computer on reinstall of Ubuntu to the Apple/Mac style 1-2-3 finger alt-clicking. I think that is a great default *for Apple computers*, but a poor one for devices like this Dell where the traditional behavior is that of a 'clickpad', i.e., where you right+click by physically clicking on the bottom right of the touchpad.
My suggested fix would be to detect the appropriate vendor and change click-method accordingly (Dell/Lenovo/ Other-> "areas" ; Apple->"fingers").
Otherwise, we need to train users what to do, because this is *entirely unexpected* behavior from anyone who doesn't use a Mac computer.