Check if you have xserver-xorg-input-evdev
installed on your system:
sudo dpkg -s xserver-xorg-input-evdev
If yes, do:
sudo add-apt-repository ppa:xorg-edgers/ppa
sudo apt-get update
sudo apt-get upgrade
If no, do:
sudo add-apt-repository ppa:xorg-edgers/ppa
sudo apt-get update
sudo apt-get install xserver-xorg-input-evdev
Reboot.
I think I can give you the answer
Open a terminal, then type:
echo "options psmouse proto=exps" | sudo tee /etc/modprobe.d/psmouse.conf
Enter your password when prompted and then press Enter.
Now, while your right mouse click should be working after a reboot, you can try doing it without a reboot, but it might crash your desktop. It didn't for me, so here it is, type in the same terminal as root:
sudo modprobe -r psmouse; sudo modprobe psmouse
hope that helps!
edit: ok, so now that the right button works, the touchpad section of the mouse settings disappeared, and so did my custom settings and the multitouch capability, which resulted in a slow mouse pointer and no ability to scroll. I think I'll write a bug report on this one.
edit2: I searched through the web, and apparently, there is some obscure way to fix this problem, but it relies on ressources and patches that aren't available so easily anymore. I fixed this problem for me by upgrading to quantal quetzal, which includes adequate (albeit not great) support for multitouch clickpads by default
Best Answer
I had exactly the same problem. Here's how to solve it. Open a terminal and type:
...and when the update/upgrade is complete, reboot your system and VOILA! The mouse (including left-click) works.