I’m quite new to Ubuntu Mate and have ran into an issue which I think may relate to all flavours of Ubuntu, at least for my laptop (Packard Bell Easynote)
I installed Ubuntu Mate 16.04 on a spare laptop. The touchpad is not working. When I check it doesn’t appear to be recognised. I tested an earlier version of Mate with the same results and also other flavours of Ubuntu based on the 14.04 release.
Sorry I should have mentioned that. I have tried the correct key with FN to make sure it wasn’t disabled this way. But the FN + key does nothing at all and it still remains non functional.