The last working version was the previous kernel: (4.15.0-70).

ii  linux-image-4.15.0-70-generic 4.15.0-70.79 amd64 
ii  linux-image-4.15.0-72-generic 4.15.0-72.81 amd64 
ii  linux-image-generic           4.15.0.72.74 amd64 

Information below is with the working kernel (4.15.0-70):
uname -a output:
Linux kububb 4.15.0-70-generic #79-Ubuntu SMP Tue Nov 12 10:36:11 UTC 2019 
x86_64 x86_64 x86_64 GNU/Linux

$ inxi -Fxxxz
System:
  Host: kububb Kernel: 4.15.0-70-generic x86_64 bits: 64 
  compiler: gcc v: 7.4.0 Desktop: KDE Plasma 5.12.9 tk: Qt 5.9.5 
  wm: kwin_x11 dm: SDDM Distro: Ubuntu 18.04.3 LTS (Bionic Beaver) 
Machine:
  Type: Laptop System: Dell product: Inspiron 15-3567 v: N/A 
  serial: <filter> Chassis: type: 9 serial: <filter> 
  Mobo: Dell model: 0FGN4M v: A00 serial: <filter> UEFI: Dell 
  v: 01.07.00 date: 04/07/2017 
Battery:
  ID-1: BAT0 charge: 29.9 Wh condition: 29.9/41.4 Wh (72%) 
  volts: 16.9/14.8 model: SMP DELL VN3N047 type: Li-ion 
  serial: <filter> status: Full 
CPU:
  Topology: Dual Core model: Intel Core i3-6006U bits: 64 type: MCP 
  arch: Skylake rev: 3 L2 cache: 3072 KiB 
  flags: lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx 
  bogomips: 7968 
  Speed: 500 MHz min/max: 400/2000 MHz Core speeds (MHz): 1: 500 
  2: 500 
Graphics:
  Device-1: Intel Skylake GT2 [HD Graphics 520] vendor: Dell 
  driver: i915 v: kernel bus ID: 00:02.0 chip ID: 8086:1916 
  Display: x11 server: X.Org 1.19.6 driver: intel 
  compositor: kwin_x11 resolution: 1366x768~60Hz 
  OpenGL: renderer: Mesa DRI Intel HD Graphics 520 (Skylake GT2) 
  v: 4.5 Mesa 19.0.8 compat-v: 3.0 direct render: Yes 

$ xinput list
⎡ Virtual core pointer                  id=2  [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer        id=4  [slave  pointer  (2)]
⎜   ↳ YSPRINGTECH USB OPTICAL MOUSE     id=10 [slave  pointer  (2)]
⎜   ↳ Synaptics TM3096-006              id=12 [slave  pointer  (2)]
⎜   ↳ SynPS/2 Synaptics TouchPad        id=16 [slave  pointer  (2)]
⎣ Virtual core keyboard                 id=3  [master keyboard (2)]
    ↳ Virtual core XTEST keyboard       id=5  [slave  keyboard (3)]
    ↳ Power Button                      id=6  [slave  keyboard (3)]
    ↳ Video Bus                         id=7  [slave  keyboard (3)]
    ↳ Power Button                      id=8  [slave  keyboard (3)]
    ↳ Sleep Button                      id=9  [slave  keyboard (3)]
    ↳ Integrated_Webcam_HD: Integrate   id=11 [slave  keyboard (3)]
    ↳ Intel HID events                  id=13 [slave  keyboard (3)]
    ↳ Dell WMI hotkeys                  id=14 [slave  keyboard (3)]
    ↳ AT Translated Set 2 keyboard      id=15 [slave  keyboard (3)]
$ 

Relevant to touchpad:
$ cat /proc/bus/input/devices

I: Bus=0011 Vendor=0002 Product=0007 Version=01a1
N: Name="SynPS/2 Synaptics TouchPad"
P: Phys=isa0060/serio1/input0
S: Sysfs=/devices/platform/i8042/serio1/input/input7
U: Uniq=
H: Handlers=mouse1 event7 
B: PROP=5
B: EV=b
B: KEY=e520 10000 0 0 0 0
B: ABS=660800011000003

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

Title:
  touchpad stopped working after the update

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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