Elemantary OS Touchpad is not working on Lenovo Ideapad 330s.
libinput and synaptics installation an configuration but it did not work.
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Did you tried this?
sudo apt install xserver-xorg-input-synaptics
Also you could check the part where you should check if you have two touchpads in the following link:
I have an IdeaPad S145 and I think it's possible that the touchpad be the same. This post worked for me.
The workaround is to pass these parameters to the kernel. i8042.nopnp=1 pci=nocrs It's recommended to test before change definitely like this.