I'm running Ubuntu 18.04 on different thinkpads and the trackpoint is very jumpy and inprecise to use.
I installed the newest Libinput packages: libinput10_1.12.1-1, libinput-bin_1.12.1-1 and xserver-xorg-input-libinput_0.28.0-1 but that didn't change much.
So my question: Is it possible to switch back to the old synaptics driver that worked well for me under Ubuntu 16.04.
I tried with intalling xserver-xorg-input-synaptics and removing xserver-xorg-input-libinput but then neither the keyboard nor the mouse/trackpoint worked. If I don't remove ...libinput nothing changes.