I tried the new kernel as you said, the touchpad works perfectly there.
Thank you!

** Tags added: kernel-fixed-upstream

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1777145

Title:
  Touchpad not detected

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  The touchpad on my laptop is not working at all, i.e. moving the
  cursor, clicking, scrolling doesn't work. Using Windows, it works. An
  external mouse also works. I followed this description
  (https://wiki.ubuntu.com/DebuggingTouchpadDetection) which lead me to
  file this bug report here.

  Laptop Model:

  Lenovo V330-14IKB
  Model Name: 81B0
  S/N: MP1D0PVX
  MTM: 81B0004RGE
  MO: MPNXB811601Q

  Ubuntu Version: 18.04 LTS
  Ubuntu 4.15.0-23.25-generic 4.15.18

  The touchpad has never worked from the beginning and seems to be not
  detected. I will attach the outputs of

  - dmesg
  - /proc/bus/input/devices
  - cat /proc/version_signature > version.log
  - sudo lspci -vnvn > lspci-vnvn.log

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