答案1
apt-get install xserver-xorg-input-synaptics-dev
重启
wget https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1166442/+attachment/3941591/+files/psmouse-elantech-x551c.tar.gz
dkms ldtarball psmouse-elantech-x551c.tar.gz
dkms install -m psmouse -v elantech-x551c
rmmod psmouse
modprobe psmouse