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-X, which is subscribed to xserver-xorg-input-synaptics in 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 _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp