I have a Dell Latitude 3580 running ubuntu-mate 17.10. When I originally installed it, The touchpad was working fine on a clean install but then I did an update and now the right click button behaves the same as the left click button. I’ve tried several things and I’d link the pages but I can’t do it with just my fingers on the touchpad. I’ve tried. I need to be able to right click. It’s not only more convenient but crucial to what I do. I don’t know male or model of the touchpad. Best I can tell it’s some sort of generic Dell thing.
Found the solution:
sudo apt install xserver-xorg-input-synaptics