I have just upgraded from ubuntu 16.04 to ubuntu 17.10. My touchpad was working on ubuntu 16.04 and also on live usb of 17.10. But, it is not working after installation. My laptop is Dell inspiron 3521
Here the things I did so far:
1) Install xserver-xorg-input-synaptics
Touchpad worked after reboot but stopped working until now after another reboot
2) Upgraded kernel to 4.14.0-041400-generic from 4.13
3) Tried copying /usr/share/X11/xorg.conf.d/70-synaptics.conf to /etc/X11/xorg.conf.d
4) Tried commenting out below lines in 40-libinput.conf
Section "InputClass"
Identifier "libinput touchpad catchall"
MatchIsTouchpad "on"
MatchDevicePath "/dev/input/event*"
Driver "libinput"
EndSection
5) Removing xserver-xorg-input-synaptics
Nothing worked so far
Best Answer
Run this command in terminal:
You will find a line like this:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
Now replace "quiet splash" with "acpi=force"
So the new line will be:
GRUB_CMDLINE_LINUX_DEFAULT="acpi=force"
Save the file.
Now run this command:
This should solve your problem.