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