In this tip, we will see a solution that will fix a non-working laptop’s touchpad. The problem often occurs after upgrading your Ubuntu distribution to Ubuntu 16.04/16.10.
Solution
Open the terminal and run these commands:
sudo apt update
sudo apt install xserver-xorg-input-synaptics
or
sudo apt install –reinstall xserver-xorg-input-synaptics
Then reboot your laptop:
sudo reboot
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Source:upubuntu