Deleting the synaptics driver resolves the issue.
It appears the driver needs to be deleted with the introduction of the libinput 
driver (now that the synaptics driver has been deprecated).

However this issue/bug occurred as the synaptic driver was not deleted
during the upgrade to 18.04 from 16.04 (most likely due the the fact
that the config file was not empty - however it would be impossible for
it to be empty if it was the driver used in 16.04, prior to the
introduction of the libinput driver with the 18.04 upgrade).

Suggestion: For all future upgrades to 18.04, there is the need to ensure the 
synaptic driver is removed to avoid breaking this functionality and introducing 
the conflict. If the user decides he/she needs the deprecated synaptics driver, 
they can always install it after.
This way, Ubuntu 18.04 and beyond would not appear defective in this instance 
after an upgrade.

Affects: Upgrades to 18.04 and newer.

Conclusion: This bug can be closed when this is fixed in future releases
of Ubuntu.

I'm not sure who needs to be communicated about this, can someone help
to see this through to ensure fix and thus closure? Thanks.

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  Touchpad hotkey 'functional' but has no effect in 18.04 (Bionic)

Status in Ubuntu:
Status in linux package in Ubuntu:
Status in xinput package in Ubuntu:
Status in xserver-xorg-input-synaptics package in Ubuntu:

Bug description:
  All the Fn keys are working (audio, mute, bright, volume and even
  wifi) except for enable/disable touchpad. Does not toggle the

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: xinput 1.6.2-1build1
  ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
  Uname: Linux 4.15.0-13-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  .proc.driver.nvidia.gpus.0000.01.00.0: Error: [Errno 21] É um diretório: 
  .proc.driver.nvidia.registry: Binary: ""
   NVRM version: NVIDIA UNIX x86_64 Kernel Module  390.42  Sat Mar  3 04:10:22 
PST 2018
   GCC version:  gcc version 7.3.0 (Ubuntu 7.3.0-13ubuntu1)
  ApportVersion: 2.20.9-0ubuntu2
  Architecture: amd64
  BootLog: Error: [Errno 13] Permissão negada: '/var/log/boot.log'
  CompositorRunning: None
  CurrentDesktop: ubuntu-communitheme:ubuntu:GNOME
  Date: Sat Mar 31 15:41:59 2018
  DistUpgraded: Fresh install
  DistroCodename: bionic
  DistroVariant: ubuntu
   nvidia, 390.42, 4.15.0-12-generic, x86_64: installed
   nvidia, 390.42, 4.15.0-13-generic, x86_64: installed
   virtualbox, 5.2.8, 4.15.0-12-generic, x86_64: installed
   virtualbox, 5.2.8, 4.15.0-13-generic, x86_64: installed
   Intel Corporation HD Graphics 530 [8086:191b] (rev 06) (prog-if 00 [VGA 
     Subsystem: Toshiba America Info Systems HD Graphics 530 [1179:f840]
  InstallationDate: Installed on 2018-03-09 (21 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180309)
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 008: ID 04f2:b446 Chicony Electronics Co., Ltd
   Bus 001 Device 003: ID 248a:8366
   Bus 001 Device 002: ID 04f3:2228 Elan Microelectronics Corp.
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: TOSHIBA Satellite S55t-C
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-13-generic 
root=UUID=62fa4fcd-f1c6-43f5-a86d-ccaae2565dac ro locale=pt_BR quiet splash 
  SourcePackage: xinput
  UpgradeStatus: No upgrade log present (probably fresh install) 10/08/2015
  dmi.bios.vendor: INSYDE Corp.
  dmi.bios.version: 1.20 06F4
  dmi.board.vendor: FF50
  dmi.board.version: Type2 - Board Version
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: OEM Chassis ManuFacturer
  dmi.chassis.version: OEM Chassis Version
dmi:bvnINSYDECorp.:bvr1.20:bd10/08/2015:svnTOSHIBA:pnSatelliteS55t-C:pvrPSPUGU-00200D:rvnFF50:rn06F4:rvrType2-BoardVersion:cvnOEMChassisManuFacturer:ct10:cvrOEMChassisVersion: Type1Family Satellite S55t-C
  dmi.product.version: PSPUGU-00200D
  dmi.sys.vendor: TOSHIBA
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.91-2
  version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.0~rc5-1ubuntu1
  version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.0~rc5-1ubuntu1
  version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu3
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2

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