Same situation here.
Kernel 3.13.0.125 doesn't exhibit the bug. Instead, kernel 4.4.0.85 exhibit the
bug.
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https://bugs.launchpad.net/bugs/1326822
Title:
HP 255 G1 Touchpad not working
Public bug reported:
After a "do-release-upgrade", when the pc booted, I found this error
message.
root@linux:~# lsb_release -rd
Description:Ubuntu Xenial Xerus (development branch)
Release:16.04
ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: plymouth 0.9.2-3ubuntu8
ProcVe