*** This bug is a duplicate of bug 1854798 ***
    https://bugs.launchpad.net/bugs/1854798

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/1854896

Title:
  Synaptics TM3336-004 Touchpad Stopped working after update to the
  latest kernel 4.15.0-72 generic

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Please see to it, my touchpad all of a sudden stopped working after reboot.
  it happened after updating to the latest kernel 4.15.0-72, i am using linux 
mint 19.2.

  Pointer version: Synaptics TM3336-004

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