Right click not working on Ubuntu 18.04

For instance, to right-click method on touchpads without a physical button you need to perform a two-finger click (just tap anywhere with two fingers). Clicking in the bottom right area of the touchpad no longer works.

If you don’t like this behaviour — and there’s a fair chance you might not — you can use the Tweaks app (see step #5) to change the setting.

Source: OMG Ubuntu (see link for how to fix it)

I too had this issue with an HP Omen.. I downloaded the gnome tweaks and it fixed the problem.

Open Ubuntu software (orange briefcase) and type in the search "gnome tweaks".. launch the program and under keyboard and mouse tab>Mouse click emulation> choose AREA..click bottom right.....

Log out and re-login if the change didn't take effect right away.

Try

sudo vi /etc/X11/xorg.conf

add:

Section "InputClass"
  Identifier "libinput touchpad catchall"
  MatchIsTouchpad "on"
  MatchDevicePath "/dev/input/event*"
  Driver "libinput"
  Option "Tapping" "True"
  Option "NaturalScrolling" "True"
EndSection