Some of the conf might be unnecessary. Worked for me on Dell XPS 13
- Disable GNOME:s conflicting gui-based conf
- Run dconf-editor
- Edit /org/gnome/settings-daemon/plugins/mouse/ (or /org/cinnamon/settings-daemon/plugins/mouse/ for cinnamon)
- Uncheck the active setting
- Add the conf file at
/etc/X11/xorg.conf.d/50-synaptics.conf