I can reproduce the issue by unplugging and usb stick! When I plug it in
nothing special happens, but when I unplug it the bug appears
immediately. The same workaroud (switching VTs) resolves it temporarily.

It does not happen 100% of the time though. It did happen 4 times in a
row a few minutes ago. I don't see anything unusual in the log. Here is
what I got when unplugging, the first time it triggered the bug:

Mar  2 13:48:02 tadzim3 kernel: [48565.861661] usb 2-2: USB disconnect, device 
number 15
Mar  2 13:48:02 tadzim3 upowerd[2322]: unhandled action 'unbind' on 
Mar  2 13:48:02 tadzim3 upowerd[2322]: unhandled action 'unbind' on 
Mar  2 13:48:02 tadzim3 dbus-daemon[1112]: [system] Activating via systemd: 
service name='org.freedesktop.hostname1' 
unit='dbus-org.freedesktop.hostname1.service' requested by ':1.1503' (uid=1000 
pid=3197 comm="/usr/bin/gnome-shell " label="unconfined")
Mar  2 13:48:02 tadzim3 systemd[1]: Starting Hostname Service...
Mar  2 13:48:02 tadzim3 dbus-daemon[1112]: [system] Successfully activated 
service 'org.freedesktop.hostname1'
Mar  2 13:48:02 tadzim3 systemd[1]: Started Hostname Service.
Mar  2 13:48:03 tadzim3 org.gnome.SettingsDaemon.Power.desktop[3308]: Error 
executing command as another user: Not authorized
Mar  2 13:48:03 tadzim3 org.gnome.SettingsDaemon.Power.desktop[3308]: This 
incident has been reported.
Mar  2 13:48:11 tadzim3 /usr/lib/gdm3/gdm-x-session[3036]: (**) Option "fd" "24"
Mar  2 13:48:11 tadzim3 /usr/lib/gdm3/gdm-x-session[3036]: (II) event2  - Power 
Button: device removed

What happens beginning at 13:48:11, 9 seconds after the USB disconnect,
seems to be the VT switch, when I worked around the bug.

You received this bug notification because you are a member of Desktop
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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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