So there is a temporary fix in libinput ( before
Benjamin's kernel fix is accepted as discussed in That fix is
already in Disco so only need to fix Cosmic.

** Also affects: libinput (Ubuntu)
   Importance: Undecided
       Status: New

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  Unable to get right-click working on ThinkPad T480s

Status in Linux:
Status in libinput package in Ubuntu:
Status in linux package in Ubuntu:

Bug description:
  Updated to Ubuntu 18.10, I've been fighting some weird behavior of the
  touchpad. Now, right-click does not work, whatever solution I try
  within gnome-tweaks, whether relying on multi-finger tapping or not.

  Found a very very close report from RedHat, on the same model of laptop, 
around kernel 4.18, with a fix:
  ProblemType: Bug
  ApportVersion: 2.20.10-0ubuntu13
  Architecture: amd64
   /dev/snd/controlC0:  alex       2871 F.... pulseaudio
  CurrentDesktop: GNOME
  DistroRelease: Ubuntu 18.10
  HibernationDevice: RESUME=LABEL="Swap"
  InstallationDate: Installed on 2012-11-03 (2195 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  MachineType: LENOVO 20L7CTO1WW
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.18.0-10-generic 
root=UUID=45c5d738-161a-4a73-9614-c529fdf655be ro quiet splash vt.handoff=1
  ProcVersionSignature: Ubuntu 4.18.0-10.11-generic 4.18.12
   linux-restricted-modules-4.18.0-10-generic N/A
   linux-backports-modules-4.18.0-10-generic  N/A
   linux-firmware                             1.175
  Tags:  cosmic
  Uname: Linux 4.18.0-10-generic x86_64
  UpgradeStatus: Upgraded to cosmic on 2018-10-22 (16 days ago)
  UserGroups: adm cdrom dialout dip disk docker kismet libvirt libvirtd lpadmin 
plugdev sambashare sudo vboxusers video
  _MarkForUpload: True 09/13/2018
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N22ET49W (1.26 )
  dmi.board.asset.tag: Not Available 20L7CTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40697 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
dmi:bvnLENOVO:bvrN22ET49W(1.26):bd09/13/2018:svnLENOVO:pn20L7CTO1WW:pvrThinkPadT480s:rvnLENOVO:rn20L7CTO1WW:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone: ThinkPad T480s 20L7CTO1WW
  dmi.product.sku: LENOVO_MT_20L7_BU_Think_FM_ThinkPad T480s
  dmi.product.version: ThinkPad T480s
  dmi.sys.vendor: LENOVO

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