*** This bug is a duplicate of bug 1854798 ***
    https://bugs.launchpad.net/bugs/1854798

I had the exact same problem, and downgrading back to version 4.15.0-70
worked fine for me, but upgrading to 5.4.2-050402 worked for me as well.

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https://bugs.launchpad.net/bugs/1854895

Title:
  touchpad stopped working after the update

Status in Linux:
  New
Status in linux package in Ubuntu:
  Confirmed

Bug description:
  After the automatic software update the touchpad stopped working in my
  laptop.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-image-4.15.0-72-generic 4.15.0-72.81
  ProcVersionSignature: Ubuntu 4.15.0-72.81-generic 4.15.18
  Uname: Linux 4.15.0-72-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.9
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  anil       1722 F.... pulseaudio
   /dev/snd/controlC0:  anil       1722 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Dec  3 10:44:48 2019
  InstallationDate: Installed on 2018-12-21 (346 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 
(20180725)
  MachineType: Dell Inc. Inspiron 3542
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-72-generic 
root=UUID=a85be26b-aca7-48bd-b03b-6a99e1587772 ro quiet splash vt.handoff=1
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-72-generic N/A
   linux-backports-modules-4.15.0-72-generic  N/A
   linux-firmware                             1.173.12
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/23/2018
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A14
  dmi.board.name: 09V1VC
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A14
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: Not Specified
  dmi.modalias: 
dmi:bvnDellInc.:bvrA14:bd05/23/2018:svnDellInc.:pnInspiron3542:pvrNotSpecified:rvnDellInc.:rn09V1VC:rvrA14:cvnDellInc.:ct8:cvrNotSpecified:
  dmi.product.name: Inspiron 3542
  dmi.product.version: Not Specified
  dmi.sys.vendor: Dell Inc.

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