Public bug reported:

>From time-to-time, when using cosmic, my keyboard presses will no longer
register.  This applies to both the internal laptop keyboard and my
external keyboard.  I haven't identified any particular trigger of this.

The one workaround I have found is to use the mouse (which is still
fully functional, along with everything else about my desktop
environment except keyboard input) to click the "Show Applications"
button; this appeared to free up my keyboard input.  (The lock-up has
happened multiple times, but it only just occurred to me to attempt that
as a work-around; this may not be reliable.)

My keyboards did continue to work perfectly fine in a serial console,
but switching to/from the console did not unlock input in GNOME Shell.
Nor did unplugging and replugging my external keyboard.

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: gnome-shell 3.30.1-2ubuntu1
ProcVersionSignature: Ubuntu 4.18.0-8.9-generic 4.18.7
Uname: Linux 4.18.0-8-generic x86_64
ApportVersion: 2.20.10-0ubuntu11
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Thu Oct 11 00:23:08 2018
DisplayManager: gdm3
InstallationDate: Installed on 2017-10-23 (352 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
SourcePackage: gnome-shell
UpgradeStatus: Upgraded to cosmic on 2018-09-10 (30 days ago)

** Affects: gnome-shell (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug cosmic

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https://bugs.launchpad.net/bugs/1797301

Title:
  Keyboard input stops being processed entirely

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