Note: This guide was based on Ubuntu 5.04.
Step 1: X Server Settings
Edit the /etc/X11/xorg.conf file and look for the “InputDevice” section, make sure it looks like this:
Section “InputDevice”
Identifier “Configured Mouse”
Driver “mouse”
Option “CorePointer”
Option “Device” “/dev/input/mice”
Option “Protocol” “ExplorerPS/2″
Option “Buttons” “7″
Option “ZAxisMapping” “4 5″
EndSection
Make sure that the ‘Buttons’ is ‘7′, ‘Protocol’ is ‘ExplorerPS/2′, and ‘ZAxisMapping’ is ‘4 5′.
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