On Wed, Sep 23, 2020 at 10:14:57PM -0000, Tessa wrote:
> Sep 23 15:07:58 boxxy gnome-shell[209336]: Screen lock is locked down,
> not locking
> 
> so it appears as if it thinks the screen is already locked, even though
> I'm interacting with my session. and the dbus call doesn't have any way

This message indicates that the screen lock has been disabled:

https://sources.debian.org/src/gnome-
shell/3.36.6-1/js/ui/screenShield.js/?hl=595#L595

I'm guessing that the setting may be named 'disable-lock-screen' in the
'org.gnome.desktop.lockdown' schema:

https://sources.debian.org/src/gnome-
shell/3.36.6-1/js/ui/screenShield.js/?hl=24#L24

try this to see the current value of the setting:

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

try this to change it:

gsettings set org.gnome.desktop.lockdown disable-lock-screen false # or
true, as needed

I hope this helps.

Thanks

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-shell in Ubuntu.
https://bugs.launchpad.net/bugs/1896416

Title:
  screen locking no longer works

Status in gdm3 package in Ubuntu:
  Incomplete
Status in gnome-shell package in Ubuntu:
  New

Bug description:
  in the last week, the gnome screen locking functionality stopped
  working. I'm under the impression this is handled by gdm3, but if not,
  please point me at the correct package.

  in any case, now there's no lock icon in the power menu in the top
  right, win-L does nothing, and trying to invoke manually with the
  gnome-screensaver package times out after about a minute with the
  following error:

  $ gnome-screensaver-command -l

  ** (gnome-screensaver-command:212161): WARNING **: 18:46:25.014: unable to 
send message: Timeout was reached
  ** Message: 18:46:25.014: Did not receive a reply from the screensaver.

  
  as well, if I suspend the system, on resume it dumps right back to the 
desktop without a prompt to re-authenticate, so this is a security issue.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: gdm3 3.34.1-1ubuntu1
  ProcVersionSignature: Ubuntu 5.4.0-47.51-lowlatency 5.4.55
  Uname: Linux 5.4.0-47-lowlatency x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair nvidia_modeset 
nvidia
  ApportVersion: 2.20.11-0ubuntu27.8
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Sun Sep 20 18:47:40 2020
  InstallationDate: Installed on 2020-07-15 (67 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  SourcePackage: gdm3
  UpgradeStatus: No upgrade log present (probably fresh install)

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