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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