Public bug reported:

Since upgrading to 18.04 the screen lock no longer works. The screen
will not lock automatically despite the setting and even Ctrl+Alt+L and
Super+L fail to do anything.

I've checked that

$ gsettings get org.gnome.desktop.lockdown disable-lock-screen
false

I'm not sure if lightdm is the correct package. I'm using lightdm, since
gdm just gave me a black screen. But not sure which package should
handle the lock.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: lightdm 1.26.0-0ubuntu1
ProcVersionSignature: Ubuntu 4.18.0-13.14~18.04.1-generic 4.18.17
Uname: Linux 4.18.0-13-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sun Jan 20 13:00:21 2019
InstallationDate: Installed on 2012-11-10 (2261 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
SourcePackage: lightdm
UpgradeStatus: Upgraded to bionic on 2019-01-17 (2 days ago)

** Affects: lightdm (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic third-party-packages wayland-session

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to lightdm in Ubuntu.
https://bugs.launchpad.net/bugs/1812556

Title:
  Screen lock does not work

Status in lightdm package in Ubuntu:
  New

Bug description:
  Since upgrading to 18.04 the screen lock no longer works. The screen
  will not lock automatically despite the setting and even Ctrl+Alt+L
  and Super+L fail to do anything.

  I've checked that

  $ gsettings get org.gnome.desktop.lockdown disable-lock-screen
  false

  I'm not sure if lightdm is the correct package. I'm using lightdm,
  since gdm just gave me a black screen. But not sure which package
  should handle the lock.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: lightdm 1.26.0-0ubuntu1
  ProcVersionSignature: Ubuntu 4.18.0-13.14~18.04.1-generic 4.18.17
  Uname: Linux 4.18.0-13-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.5
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Sun Jan 20 13:00:21 2019
  InstallationDate: Installed on 2012-11-10 (2261 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  SourcePackage: lightdm
  UpgradeStatus: Upgraded to bionic on 2019-01-17 (2 days ago)

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