I just installed Kubuntu on my Dell XPS 15 9570. Everything is working fine, except for tap to click on the touchpad.
I can activate the option in the settings but this has no effect.
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After some additional searching I found the solution to my problem here
I had to add
Option "Tapping" "True" to the entry
MatchIsTouchpad in the file
/usr/share/X11/xorg.conf.d/40-libinput.conf. The exact name of the file might be different for other people.
In the end, the relevant section will look like something like this:
Section "InputClass" Identifier "libinput touchpad catchall" MatchIsTouchpad "on" Option "Tapping" "True" MatchDevicePath "/dev/input/event*" Driver "libinput" EndSection
You need to be root to edit the file and reboot your system after the changes!