Follow this steps, it works for me:

1. Run
    $ sudo -H gedit /etc/default/grub

In the open window edit line

    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

it should look this way

    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash i8042.nopnp"

Save file and run

    $ sudo update-grub

2. Run
    $ echo "blacklist i2c_hid" | sudo tee /etc/modprobe.d/i2c-hid.conf
    $ sudo depmod -a
    $ sudo update-initramfs -u
    $ echo "synaptics_i2c" | sudo tee -a /etc/modules

3. Reboot.

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https://bugs.launchpad.net/bugs/1854798

Title:
  Synaptics s3203 touchpad not working after update to kernel
  4.15.0-72-generic

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