*** This bug is a duplicate of bug 1854798 ***
https://bugs.launchpad.net/bugs/1854798
I had the same problem with linux-image-4.15.0-72 on a Dell XPS-12 (9Q33 model).
The temporary fix I applied (to ensure a working kernel wasn't deleted
automaticall) was
sudo apt-mark hold linux-image-4.15.0-72-generic
and I uninstalled linux-image-generic.
linux-image-4.15.0-74-generic has been released and the touchpad WORKS
fine for me now.
sudo apt-mark unhold linux-image-4.15.0-72-generic
sudo apt update
sudo apt install linux-image-generic
ensured the 4.15.0-74 kernel, linux-modules and linux-modules-extra were
installed for 4.15.0-74. You may or may not want to continue holding
the previous known working kernel version.
Note: When testing linux-image-4.15.0-74-generic I just installed it and
linux-modules, but my WiFi also requires linux-modules-extra.
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https://bugs.launchpad.net/bugs/1854895
Title:
touchpad stopped working after the update
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