Public bug reported:

After today upgrade of:

Start-Date: 2018-09-04  12:06:31
Commandline: packagekit role='update-packages'
Upgrade: 
  libgpgmepp6:amd64 (1.10.0-1ubuntu1, 1.10.0-1ubuntu2),
  libpackagekit-glib2-18:amd64 (1.1.9-1ubuntu2, 1.1.9-1ubuntu2.18.04.1),
  libgpgme11:amd64 (1.10.0-1ubuntu1, 1.10.0-1ubuntu2),
  console-setup-linux:amd64 (1.178ubuntu2.6, 1.178ubuntu2.7),
  console-setup:amd64 (1.178ubuntu2.6, 1.178ubuntu2.7),
  packagekit-tools:amd64 (1.1.9-1ubuntu2, 1.1.9-1ubuntu2.18.04.1),
  packagekit:amd64 (1.1.9-1ubuntu2, 1.1.9-1ubuntu2.18.04.1),
  keyboard-configuration:amd64 (1.178ubuntu2.6, 1.178ubuntu2.7),
  gir1.2-packagekitglib-1.0:amd64 (1.1.9-1ubuntu2, 1.1.9-1ubuntu2.18.04.1),
  libqgpgme7:amd64 (1.10.0-1ubuntu1, 1.10.0-1ubuntu2) 

when I lock my screen with Ctrl-Alt-L I get the lock screen background image 
and nothing more.
I am unable to unlock the GUI.

I can go to a different virtual terminal with Ctrl+Alt+F2, but to get
back to the GUI I need to reboot the host.

I have a dual monitor setup with one monitor rotated at 90 degrees.
When I disconnect the rotated screen, I do get to see the password field and 
the unlock button, but I can't interact not with the keyboard nor with the 
mouse, and I am forced to reboot then too.

As a work around I disabled the automatic locking of the screen, but
this is not a secure solution.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: plasma-desktop 4:5.12.6-0ubuntu0.1
ProcVersionSignature: Ubuntu 4.15.0-33.36-generic 4.15.18
Uname: Linux 4.15.0-33-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
CurrentDesktop: KDE
Date: Tue Sep  4 15:18:02 2018
InstallationDate: Installed on 2018-03-20 (167 days ago)
InstallationMedia: Kubuntu 17.10 "Artful Aardvark" - Release amd64 (20180105.2)
SourcePackage: plasma-desktop
UpgradeStatus: Upgraded to bionic on 2018-04-29 (128 days ago)

** Affects: plasma-desktop (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic

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https://bugs.launchpad.net/bugs/1790633

Title:
  Lock screen has nno widget to enter password

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