I encounter some problems with my touchpad since ubuntu 18.04 installation 1 month ago. I have some difficulties to move windows or select texts with the left click pressed. Most of the time there is no effect I need to repeat the action three or four time before of success which is a bit annoying... and most of the time to overcome this problem I simply use Right click and select move to achieve but it is also annoying.
I tried to several solutions proposed on others posts such as tweak tool and manage the different parameters of the mouse and keyboard section but with no effect.
I do not really know what can be the cause of that bug.