I have even installed a new version of Ubuntu Mate to get the priamry (left) mouse click to work. The new version works no better. I have no idea why the primary mouse click began to get no results after several months of fine use, but it no longer works. I installed a new version (15.10) but the same results. Even getting out a USB mouse instead of the track pad has no better results.
Right now Ubuntu Mate is useless.
Is there a solution or something I can download to my old Dell Inspiron 6000?
Larry