Adding the file "/etx/X11/xorg.conf" like it was recommended in comment #5 solved the problem for me:
Section "InputClass" Identifier "touchpad catchall" Driver "libinput" MatchIsTouchpad "on" MatchDevicePath "/dev/input/event*" EndSection -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1683037 Title: touchpad mouse not moves hoizontally in kubuntu 17.04. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xinput/+bug/1683037/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs