Public bug reported:

In Gnome, when I hit "Super-L" my screen freezes but the image remains
intact instead of taking me to a login screen.

Further, I can still access the application dock and start applications
(though I cannot see the apps or interact with them) and I can interact
with the top activities bar.


Maybe it's useful, maybe not, but I'm using X11 not Wayland due to an issue 
with my NVidia card.

$ gnome-screensaver-command --lock

** (gnome-screensaver-command:22849): WARNING **: 10:37:00.517: unable to send 
message: Timeout was reached
** Message: 10:37:00.517: Did not receive a reply from the screensaver.


$ vi /var/log/syslog
Dec  1 10:36:31 hostname dbus-daemon[1488]: [session uid=123 pid=1488] Reloaded 
configuration
Dec  1 10:36:31 hostname dbus-daemon[2445]: [session uid=1000 pid=2445] 
Reloaded configuration
Dec  1 10:36:31 hostname dbus-daemon[1488]: [session uid=123 pid=1488] Reloaded 
configuration
Dec  1 10:36:31 hostname dbus-daemon[2445]: [session uid=1000 pid=2445] 
Reloaded configuration
Dec  1 10:36:31 hostname dbus-daemon[1488]: [session uid=123 pid=1488] Reloaded 
configuration
Dec  1 10:36:31 hostname dbus-daemon[2445]: [session uid=1000 pid=2445] 
Reloaded configuration
Dec  1 10:36:35 hostname gnome-shell[2614]: pushModal: invocation of 
begin_modal failed
Dec  1 10:36:35 hostname gnome-shell[2614]: ../../../../gobject/gsignal.c:2641: 
instance '0x556570a1cbb0' has no handler with id '143890'
Dec  1 10:36:35 hostname gnome-shell[2614]: ../../../../gobject/gsignal.c:2641: 
instance '0x556570a1cbb0' has no handler with id '143891'
Dec  1 10:36:35 hostname gnome-shell[2614]: Object Meta.WindowActor 
(0x556573104440), has been already deallocated — impossible to access it. This 
might be caused by the object having been destroyed from C code using something 
such as destroy(), dispose(), or remove() vfuncs.
Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: == Stack trace for 
context 0x55656e024200 ==
Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #0   7ffe9ff3c590 b   
resource:///org/gnome/gjs/modules/overrides/GObject.js:468 (7f6fa3ecc040 @ 25)
Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #1   5565960b1138 i   
/usr/share/gnome-shell/extensions/ubuntu-d...@ubuntu.com/theming.js:416 
(7f6fa068aca0 @ 20)
Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #2   7ffe9ff3d700 b   
self-hosted:261 (7f6fa3ec1dc0 @ 223)
Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #3   5565960b1080 i   
/usr/share/gnome-shell/extensions/ubuntu-d...@ubuntu.com/theming.js:415 
(7f6fa068ac10 @ 172)
Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #4   7ffe9ff3e810 b   
resource:///org/gnome/gjs/modules/_legacy.js:82 (7f6fa3eb0b80 @ 71)
Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #5   5565960b1000 i   
/usr/share/gnome-shell/extensions/ubuntu-d...@ubuntu.com/theming.js:424 
(7f6fa068ad30 @ 17)
Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #6   7ffe9ff3f780 b   
resource:///org/gnome/gjs/modules/_legacy.js:82 (7f6fa3eb0b80 @ 71)
Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #7   5565960b0f80 i   
/usr/share/gnome-shell/extensions/ubuntu-d...@ubuntu.com/theming.js:89 
(7f6fa068a430 @ 42)
Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #8   7ffe9ff406f0 b   
resource:///org/gnome/gjs/modules/_legacy.js:82 (7f6fa3eb0b80 @ 71)
Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #9   5565960b0ef8 i   
/usr/share/gnome-shell/extensions/ubuntu-d...@ubuntu.com/docking.js:456 
(7f6fa067f280 @ 82)
Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #10   7ffe9ff41660 b   
resource:///org/gnome/gjs/modules/_legacy.js:82 (7f6fa3eb0b80 @ 71)
Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #11   5565960b0e60 i   
/usr/share/gnome-shell/extensions/ubuntu-d...@ubuntu.com/docking.js:1784 
(7f6fa0684670 @ 116)
Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #12   7ffe9ff425d0 b   
resource:///org/gnome/gjs/modules/_legacy.js:82 (7f6fa3eb0b80 @ 71)
Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #13   5565960b0de0 i   
/usr/share/gnome-shell/extensions/ubuntu-d...@ubuntu.com/docking.js:1903 
(7f6fa0684a60 @ 37)
Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #14   7ffe9ff43540 b   
resource:///org/gnome/gjs/modules/_legacy.js:82 (7f6fa3eb0b80 @ 71)
Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #15   5565960b0d60 i   
/usr/share/gnome-shell/extensions/ubuntu-d...@ubuntu.com/extension.js:31 
(7f6fa06759d0 @ 12)
Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #16   5565960b0ca0 i   
resource:///org/gnome/shell/ui/extensionSystem.js:83 (7f6fa3a5a040 @ 436)
Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #17   5565960b0c20 i   
resource:///org/gnome/shell/ui/extensionSystem.js:354 (7f6fa3a5ab80 @ 13)
Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #18   7ffe9ff446b0 b   
self-hosted:261 (7f6fa3ec1dc0 @ 223)
Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #19   5565960b0ba0 i   
resource:///org/gnome/shell/ui/extensionSystem.js:353 (7f6fa3a5aaf0 @ 64)
Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #20   5565960b0b20 i   
resource:///org/gnome/shell/ui/extensionSystem.js:371 (7f6fa3a5ac10 @ 87)
Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #21   7ffe9ff457f0 b   
resource:///org/gnome/gjs/modules/signals.js:128 (7f6fa3ec18b0 @ 386)
Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #22   7ffe9ff46410 b   
resource:///org/gnome/shell/ui/sessionMode.js:208 (7f6fa3841ca0 @ 254)
Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #23   7ffe9ff47090 b   
resource:///org/gnome/gjs/modules/_legacy.js:82 (7f6fa3eb0b80 @ 71)
Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #24   5565960b09e0 i   
resource:///org/gnome/shell/ui/sessionMode.js:170 (7f6fa3841a60 @ 40)
Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #25   7ffe9ff48010 b   
resource:///org/gnome/gjs/modules/_legacy.js:82 (7f6fa3eb0b80 @ 71)
Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #26   5565960b0938 i   
resource:///org/gnome/shell/ui/screenShield.js:1282 (7f6fa38289d0 @ 188)
Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #27   7ffe9ff48f90 b   
resource:///org/gnome/gjs/modules/_legacy.js:82 (7f6fa3eb0b80 @ 71)
Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #28   5565960b0888 i   
resource:///org/gnome/shell/ui/screenShield.js:1331 (7f6fa3828a60 @ 391)
Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #29   7ffe9ff49f10 b   
resource:///org/gnome/gjs/modules/_legacy.js:82 (7f6fa3eb0b80 @ 71)
Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #30   5565960b0800 i   
resource:///org/gnome/shell/ui/shellDBus.js:371 (7f6fa3831d30 @ 67)
Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #31   7ffe9ff4ae90 b   
resource:///org/gnome/gjs/modules/_legacy.js:82 (7f6fa3eb0b80 @ 71)
Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #32   5565960b0738 i   
resource:///org/gnome/gjs/modules/overrides/Gio.js:295 (7f6fa3ebd5e0 @ 604)
Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #33   5565960b0690 i   
resource:///org/gnome/gjs/modules/overrides/Gio.js:326 (7f6fa3ebd820 @ 34)

I also saw the message "Screen lock is locked down, not locking" but
that appears to be at hibernation/sleep rather than lock.

I also saw this AskUbuntu page, but they didn't give an indication that
they'd posted a formal bug:

https://askubuntu.com/questions/1082761/automatic-locking-screen-doesnt-
work-in-ubuntu-18-10

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: xorg 1:7.7+19ubuntu8
ProcVersionSignature: Ubuntu 4.18.0-10.11-generic 4.18.12
Uname: Linux 4.18.0-10-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
.proc.driver.nvidia.gpus.0000.01.00.0: Error: [Errno 21] Is a directory: 
'/proc/driver/nvidia/gpus/0000:01:00.0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module  390.87  Tue Aug 21 12:33:05 
PDT 2018
 GCC version:  gcc version 8.2.0 (Ubuntu 8.2.0-7ubuntu1)
ApportVersion: 2.20.10-0ubuntu13.1
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Sat Dec  1 11:01:35 2018
DistUpgraded: Fresh install
DistroCodename: cosmic
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
 Intel Corporation HD Graphics 530 [8086:1912] (rev 06) (prog-if 00 [VGA 
controller])
   Subsystem: Dell HD Graphics 530 [1028:06b7]
 NVIDIA Corporation GM107GL [Quadro K2200] [10de:13ba] (rev a2) (prog-if 00 
[VGA controller])
   Subsystem: NVIDIA Corporation GM107GL [Quadro K2200] [10de:1097]
InstallationDate: Installed on 2018-11-16 (14 days ago)
InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.3)
MachineType: Dell Inc. Precision Tower 3620
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.18.0-10-generic 
root=UUID=de881e3f-27b8-44b5-9e72-86a1d5b774b0 ro quiet splash vt.handoff=1
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/06/2017
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 2.3.5
dmi.board.name: 09WH54
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 3
dmi.chassis.vendor: Dell Inc.
dmi.modalias: 
dmi:bvnDellInc.:bvr2.3.5:bd08/06/2017:svnDellInc.:pnPrecisionTower3620:pvr:rvnDellInc.:rn09WH54:rvrA00:cvnDellInc.:ct3:cvr:
dmi.product.family: Precision
dmi.product.name: Precision Tower 3620
dmi.product.sku: 06B7
dmi.sys.vendor: Dell Inc.
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.95-1
version.libgl1-mesa-dri: libgl1-mesa-dri 18.2.2-0ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.1-3ubuntu2.1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A

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


** Tags: amd64 apport-bug cosmic possible-manual-nvidia-install ubuntu

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1806194

Title:
  Lock screen / Screensaver doesn't work in Ubuntu 18.10

Status in xorg package in Ubuntu:
  New

Bug description:
  In Gnome, when I hit "Super-L" my screen freezes but the image remains
  intact instead of taking me to a login screen.

  Further, I can still access the application dock and start
  applications (though I cannot see the apps or interact with them) and
  I can interact with the top activities bar.

  
  Maybe it's useful, maybe not, but I'm using X11 not Wayland due to an issue 
with my NVidia card.

  $ gnome-screensaver-command --lock

  ** (gnome-screensaver-command:22849): WARNING **: 10:37:00.517: unable to 
send message: Timeout was reached
  ** Message: 10:37:00.517: Did not receive a reply from the screensaver.


  
  $ vi /var/log/syslog
  Dec  1 10:36:31 hostname dbus-daemon[1488]: [session uid=123 pid=1488] 
Reloaded configuration
  Dec  1 10:36:31 hostname dbus-daemon[2445]: [session uid=1000 pid=2445] 
Reloaded configuration
  Dec  1 10:36:31 hostname dbus-daemon[1488]: [session uid=123 pid=1488] 
Reloaded configuration
  Dec  1 10:36:31 hostname dbus-daemon[2445]: [session uid=1000 pid=2445] 
Reloaded configuration
  Dec  1 10:36:31 hostname dbus-daemon[1488]: [session uid=123 pid=1488] 
Reloaded configuration
  Dec  1 10:36:31 hostname dbus-daemon[2445]: [session uid=1000 pid=2445] 
Reloaded configuration
  Dec  1 10:36:35 hostname gnome-shell[2614]: pushModal: invocation of 
begin_modal failed
  Dec  1 10:36:35 hostname gnome-shell[2614]: 
../../../../gobject/gsignal.c:2641: instance '0x556570a1cbb0' has no handler 
with id '143890'
  Dec  1 10:36:35 hostname gnome-shell[2614]: 
../../../../gobject/gsignal.c:2641: instance '0x556570a1cbb0' has no handler 
with id '143891'
  Dec  1 10:36:35 hostname gnome-shell[2614]: Object Meta.WindowActor 
(0x556573104440), has been already deallocated — impossible to access it. This 
might be caused by the object having been destroyed from C code using something 
such as destroy(), dispose(), or remove() vfuncs.
  Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: == Stack trace for 
context 0x55656e024200 ==
  Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #0   7ffe9ff3c590 b   
resource:///org/gnome/gjs/modules/overrides/GObject.js:468 (7f6fa3ecc040 @ 25)
  Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #1   5565960b1138 i   
/usr/share/gnome-shell/extensions/ubuntu-d...@ubuntu.com/theming.js:416 
(7f6fa068aca0 @ 20)
  Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #2   7ffe9ff3d700 b   
self-hosted:261 (7f6fa3ec1dc0 @ 223)
  Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #3   5565960b1080 i   
/usr/share/gnome-shell/extensions/ubuntu-d...@ubuntu.com/theming.js:415 
(7f6fa068ac10 @ 172)
  Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #4   7ffe9ff3e810 b   
resource:///org/gnome/gjs/modules/_legacy.js:82 (7f6fa3eb0b80 @ 71)
  Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #5   5565960b1000 i   
/usr/share/gnome-shell/extensions/ubuntu-d...@ubuntu.com/theming.js:424 
(7f6fa068ad30 @ 17)
  Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #6   7ffe9ff3f780 b   
resource:///org/gnome/gjs/modules/_legacy.js:82 (7f6fa3eb0b80 @ 71)
  Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #7   5565960b0f80 i   
/usr/share/gnome-shell/extensions/ubuntu-d...@ubuntu.com/theming.js:89 
(7f6fa068a430 @ 42)
  Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #8   7ffe9ff406f0 b   
resource:///org/gnome/gjs/modules/_legacy.js:82 (7f6fa3eb0b80 @ 71)
  Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #9   5565960b0ef8 i   
/usr/share/gnome-shell/extensions/ubuntu-d...@ubuntu.com/docking.js:456 
(7f6fa067f280 @ 82)
  Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #10   7ffe9ff41660 b  
 resource:///org/gnome/gjs/modules/_legacy.js:82 (7f6fa3eb0b80 @ 71)
  Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #11   5565960b0e60 i  
 /usr/share/gnome-shell/extensions/ubuntu-d...@ubuntu.com/docking.js:1784 
(7f6fa0684670 @ 116)
  Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #12   7ffe9ff425d0 b  
 resource:///org/gnome/gjs/modules/_legacy.js:82 (7f6fa3eb0b80 @ 71)
  Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #13   5565960b0de0 i  
 /usr/share/gnome-shell/extensions/ubuntu-d...@ubuntu.com/docking.js:1903 
(7f6fa0684a60 @ 37)
  Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #14   7ffe9ff43540 b  
 resource:///org/gnome/gjs/modules/_legacy.js:82 (7f6fa3eb0b80 @ 71)
  Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #15   5565960b0d60 i  
 /usr/share/gnome-shell/extensions/ubuntu-d...@ubuntu.com/extension.js:31 
(7f6fa06759d0 @ 12)
  Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #16   5565960b0ca0 i  
 resource:///org/gnome/shell/ui/extensionSystem.js:83 (7f6fa3a5a040 @ 436)
  Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #17   5565960b0c20 i  
 resource:///org/gnome/shell/ui/extensionSystem.js:354 (7f6fa3a5ab80 @ 13)
  Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #18   7ffe9ff446b0 b  
 self-hosted:261 (7f6fa3ec1dc0 @ 223)
  Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #19   5565960b0ba0 i  
 resource:///org/gnome/shell/ui/extensionSystem.js:353 (7f6fa3a5aaf0 @ 64)
  Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #20   5565960b0b20 i  
 resource:///org/gnome/shell/ui/extensionSystem.js:371 (7f6fa3a5ac10 @ 87)
  Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #21   7ffe9ff457f0 b  
 resource:///org/gnome/gjs/modules/signals.js:128 (7f6fa3ec18b0 @ 386)
  Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #22   7ffe9ff46410 b  
 resource:///org/gnome/shell/ui/sessionMode.js:208 (7f6fa3841ca0 @ 254)
  Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #23   7ffe9ff47090 b  
 resource:///org/gnome/gjs/modules/_legacy.js:82 (7f6fa3eb0b80 @ 71)
  Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #24   5565960b09e0 i  
 resource:///org/gnome/shell/ui/sessionMode.js:170 (7f6fa3841a60 @ 40)
  Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #25   7ffe9ff48010 b  
 resource:///org/gnome/gjs/modules/_legacy.js:82 (7f6fa3eb0b80 @ 71)
  Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #26   5565960b0938 i  
 resource:///org/gnome/shell/ui/screenShield.js:1282 (7f6fa38289d0 @ 188)
  Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #27   7ffe9ff48f90 b  
 resource:///org/gnome/gjs/modules/_legacy.js:82 (7f6fa3eb0b80 @ 71)
  Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #28   5565960b0888 i  
 resource:///org/gnome/shell/ui/screenShield.js:1331 (7f6fa3828a60 @ 391)
  Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #29   7ffe9ff49f10 b  
 resource:///org/gnome/gjs/modules/_legacy.js:82 (7f6fa3eb0b80 @ 71)
  Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #30   5565960b0800 i  
 resource:///org/gnome/shell/ui/shellDBus.js:371 (7f6fa3831d30 @ 67)
  Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #31   7ffe9ff4ae90 b  
 resource:///org/gnome/gjs/modules/_legacy.js:82 (7f6fa3eb0b80 @ 71)
  Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #32   5565960b0738 i  
 resource:///org/gnome/gjs/modules/overrides/Gio.js:295 (7f6fa3ebd5e0 @ 604)
  Dec  1 10:36:35 hostname org.gnome.Shell.desktop[2614]: #33   5565960b0690 i  
 resource:///org/gnome/gjs/modules/overrides/Gio.js:326 (7f6fa3ebd820 @ 34)

  I also saw the message "Screen lock is locked down, not locking" but
  that appears to be at hibernation/sleep rather than lock.

  I also saw this AskUbuntu page, but they didn't give an indication
  that they'd posted a formal bug:

  https://askubuntu.com/questions/1082761/automatic-locking-screen-
  doesnt-work-in-ubuntu-18-10

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: xorg 1:7.7+19ubuntu8
  ProcVersionSignature: Ubuntu 4.18.0-10.11-generic 4.18.12
  Uname: Linux 4.18.0-10-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  .proc.driver.nvidia.gpus.0000.01.00.0: Error: [Errno 21] Is a directory: 
'/proc/driver/nvidia/gpus/0000:01:00.0'
  .proc.driver.nvidia.registry: Binary: ""
  .proc.driver.nvidia.version:
   NVRM version: NVIDIA UNIX x86_64 Kernel Module  390.87  Tue Aug 21 12:33:05 
PDT 2018
   GCC version:  gcc version 8.2.0 (Ubuntu 8.2.0-7ubuntu1)
  ApportVersion: 2.20.10-0ubuntu13.1
  Architecture: amd64
  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
  CompositorRunning: None
  CurrentDesktop: ubuntu:GNOME
  Date: Sat Dec  1 11:01:35 2018
  DistUpgraded: Fresh install
  DistroCodename: cosmic
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation HD Graphics 530 [8086:1912] (rev 06) (prog-if 00 [VGA 
controller])
     Subsystem: Dell HD Graphics 530 [1028:06b7]
   NVIDIA Corporation GM107GL [Quadro K2200] [10de:13ba] (rev a2) (prog-if 00 
[VGA controller])
     Subsystem: NVIDIA Corporation GM107GL [Quadro K2200] [10de:1097]
  InstallationDate: Installed on 2018-11-16 (14 days ago)
  InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 
(20181017.3)
  MachineType: Dell Inc. Precision Tower 3620
  ProcEnviron:
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.18.0-10-generic 
root=UUID=de881e3f-27b8-44b5-9e72-86a1d5b774b0 ro quiet splash vt.handoff=1
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/06/2017
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 2.3.5
  dmi.board.name: 09WH54
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 3
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr2.3.5:bd08/06/2017:svnDellInc.:pnPrecisionTower3620:pvr:rvnDellInc.:rn09WH54:rvrA00:cvnDellInc.:ct3:cvr:
  dmi.product.family: Precision
  dmi.product.name: Precision Tower 3620
  dmi.product.sku: 06B7
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.95-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 18.2.2-0ubuntu1
  version.libgl1-mesa-glx: libgl1-mesa-glx N/A
  version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.20.1-3ubuntu2.1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
  version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A

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