I have upgraded to Ubuntu 17.10 (I had 14.04 installed). Since then, my touchpad does not respond. When I use a mouse it works perfectly.
My laptop is a Packard Bell
Are you sure you haven't disabled the touchpad on your keyboard? It is toggled by (Fn)+F6 on my Packard-Bell laptop.
It appears to be another Wayland problem. If I run 17.10 on Wayland on my Packard-Bell EasyNote laptop the touchpad is unresponsive but running 17.10 on Xorg the touchpad works perfectly.
When I boot into GDM I get the choice of Ubuntu (which is on Wayland) and Ubuntu on Xorg. If you have the same menu I suggest you use Ubuntu on Xorg as a workaround for the time being.
I will report the bug.
xinput
output there. We can't read it in the comments