Touchpad not working on Ubuntu 14.04

My research indicate that your laptop has a SynPS/2 Synaptics TouchPad

Execute the following command

xinput list

You should see a output like the following

⎡ Virtual core pointer                      id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer            id=4    [slave  pointer  (2)]
⎜   ↳ Logitech Unifying Device. Wireless PID:1025   id=11   [slave  pointer  (2)]
⎣ Virtual core keyboard                     id=3    [master keyboard (2)]
    ↳ Virtual core XTEST keyboard           id=5    [slave  keyboard (3)]
    ↳ Power Button                          id=6    [slave  keyboard (3)]
    ↳ Video Bus                             id=7    [slave  keyboard (3)]
    ↳ Power Button                          id=8    [slave  keyboard (3)]
    ↳ USB Camera                            id=9    [slave  keyboard (3)]
    ↳ AT Translated Set 2 keyboard          id=10   [slave  keyboard (3)]
    ↳ Toshiba input device                  id=12   [slave  keyboard (3)]
    ↳ Logitech Logitech Wireless Headset    id=14   [slave  keyboard (3)]

To enable the touch pad

xinput set-prop [device id] "Device Enabled" 1

You can do a following to check the properties

xinput --watch-props [device number]

You also can try

lsmod 
lsmod | grep mouse (Check the if the touchpad is loaded)

sudo modprobe -r psmouse
sudo modprobe psmouse proto=imps

Also you can take look at following post too.

Touchpad not working on MSi U130 after login in

Reference: Touchpad under 16.04 not working

Solution #1

1. Modify the GRUB file with a text editor (nano works too)

   sudo -H gedit /etc/default/grub
   

2. Locate this line in the grub file

   GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
   

3. Replace it with the following:

   GRUB_CMDLINE_LINUX_DEFAULT="quiet splash i8042.nopnp" 
   

4. Save the GRUB file and run the update

   sudo update-grub
   

5. Shutdown / reboot for the changes to take effect.

   sudo shutdown -r now
   

Solution #2

1. Modify the GRUB file with a text editor (nano works too)

   sudo -H gedit /etc/default/grub
   

2. Locate this line in the grub file

   GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
   

3. Replace it with the following: (ONLY DIFFERENCE FROM SOLUTION 1)

   GRUB_CMDLINE_LINUX_DEFAULT="i8042.reset quiet splash"
   

4. Save the GRUB file and run the update

   sudo update-grub
   

5. Shutdown / reboot for the changes to take effect.

   sudo shutdown -r now