Just tried on a fresh install of ubuntu 15.04 by replacing 'xserver-xorg-input-synaptics-lts-utopic' by 'xserver-xorg-input-synaptics'.
Everything went fine but at the end, after a reboot, nothing changes, the behaviour is still the same as before.
Just tried on a fresh install of ubuntu 15.04 by replacing 'xserver- xorg-input- synaptics- lts-utopic' by 'xserver- xorg-input- synaptics' .
Everything went fine but at the end, after a reboot, nothing changes, the behaviour is still the same as before.