My laptop has a synaptic touchpad and its horizontal scroll was not working ever since I moved to Ubuntu. I didn’t pay attention to it in the beginning as it was not much of a use. But later on it started bugging me so I finally decided to resolve this problem.

Well, installing gsynaptics and enabling the horizontal scroll didn’t work for me but that may work for you. So try this:
In terminal, type:

sudo apt-get install gsynaptics

Type in your password and let it install the package. After installation, go to System->Preferences->Touchpad.

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