It seems Unity is not affected. I took some time to respond because I
could not reproduce the bug yesterday after rebooting the machine. It
seems something triggers the bug, and once it has been triggered I can
consistently reproduce it with pm-suspend, even after logging out and
back in (this in itself makes the issue disappear, but suspending makes
it appear again).

So now that it occurred again, I logged several times into Unity and
Gnome Shell (xorg), and executing pm-suspend always made the problem
appear in Gnome Shell, and never did in Unity.

I still do not know what triggers the bug in the first place, but it
seems to occur usually when I go from work to home or vice versa, which
implies suspending, closing the lid, unplugging the AC adapter, external
monitor and USB hub.

For what it's worth, the problem occurs with my USB mouse and with my
Bluetooth mouse.

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  Left mouse button gets stuck down (in software), usually after

Status in gnome-shell package in Ubuntu:
Status in libinput package in Ubuntu:
Status in mutter package in Ubuntu:

Bug description:
  Sometimes the left mouse button stops working. The right button, the
  movements, and the keyboard all still work normally. The laptop's
  touch screen also still works. The left mouse button doesn't work
  anywhere, neither in the application nor in the shell widgets.

  Unplugging/plugging the (usb) mouse has no effect.

  Logging out and back in does temporarily solve the problem.

  It usually occurs after resuming from suspend, but it once did occur
  shortly after plugging in an usb pendrive (this might be a coincidence
  of course).

  This is with Gnome Shell on Wayland, on 18.04.

  This report is similar to bug 1743183, except in that bug it seems the
  left mouse button never works in Wayland. In my case, it usually
  works, but stops working after a while.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: gnome-shell 3.26.2-0ubuntu3
  ProcVersionSignature: Ubuntu 4.15.0-10.11-generic 4.15.3
  Uname: Linux 4.15.0-10-generic x86_64
  ApportVersion: 2.20.8-0ubuntu10
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Thu Mar  1 17:26:46 2018
  DisplayManager: gdm3
  InstallationDate: Installed on 2015-01-23 (1132 days ago)
  InstallationMedia: Ubuntu-GNOME 14.04.1 LTS "Trusty Tahr" - Release amd64 
  SourcePackage: gnome-shell
  UpgradeStatus: Upgraded to bionic on 2018-01-10 (49 days ago)

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