Comment 29 for bug 1854798

Hi - message for AaronMa (mapengyu)

I can confirm your steps work in the post above.

I upgraded my kernel to '4.15.0-72-generic' and my touchpad stopped working

Touchpad Hardware is: Synaptics TM2976-002

My touchpad now works again after the following steps:

Could you test the following kernel ppa please:

sudo add-apt-repository ppa:mapengyu/bionic-oem
sudo apt-get update

sudo apt install linux-image-unsigned-4.15.0-73-generic linux-modules-4.15.0-73-generic linux-modules-extra-4.15.0-73-generic

Note: For anyone else out there that needs this fix, if you are using the broadcom-sta ko for your wireless and it is loaded via dkms, you will also need to install the kernel headers in order for dkms to do its thing

sudo apt-get install linux-headers-4.15.0-73-generic

Thanks to AaronMa/whomever fixed the bug