Please run this command and tell us what you get:
gsettings get org.gnome.desktop.lockdown disable-lock-screen
Also your lock delay is set to 1800 (30 minutes?) so please try:
gsettings set org.gnome.desktop.screensaver lock-delay 0
gsettings set org.gnome.desktop.screensaver lock-enabled true
and then log out and in again to be sure.
** Changed in: gnome-shell (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1880785
Title:
Cannot enable 'Lock screen on suspend'
Status in gnome-shell package in Ubuntu:
Incomplete
Bug description:
I am trying to make my laptop lock the screen upon unsuspending. I
have made sure that the setting is enabled in 'Settings > Privacy >
Screen lock > Lock screen on suspend', but my laptop opens without a
lock screen when I open it or press a key. This only started since
upgrading to Ubuntu 20.04. Previously, I would have a locked screen
and be prompted for a password upon unsuspending.
$ gsettings get org.gnome.desktop.screensaver ubuntu-lock-on-suspend
true
$ lsb_release -rd
Description: Ubuntu 20.04 LTS
Release: 20.04
$ apt-cache policy gnome-shell
gnome-shell:
Installed: 3.36.2-1ubuntu1~20.04.1
Candidate: 3.36.2-1ubuntu1~20.04.1
Version table:
*** 3.36.2-1ubuntu1~20.04.1 500
500 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
100 /var/lib/dpkg/status
3.36.1-5ubuntu1 500
500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gnome-shell 3.36.2-1ubuntu1~20.04.1
ProcVersionSignature: Ubuntu 5.4.0-31.35-generic 5.4.34
Uname: Linux 5.4.0-31-generic x86_64
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Tue May 26 21:28:39 2020
DisplayManager: lightdm
DistributionChannelDescriptor:
# This is a distribution channel descriptor
# For more information see
http://wiki.ubuntu.com/DistributionChannelDescriptor
canonical-oem-somerville-xenial-amd64-20160624-2
InstallationDate: Installed on 2018-07-16 (680 days ago)
InstallationMedia: Ubuntu 16.04 "Xenial" - Build amd64 LIVE Binary
20160624-10:47
RelatedPackageVersions: mutter-common 3.36.2-1ubuntu1~20.04.1
SourcePackage: gnome-shell
UpgradeStatus: Upgraded to focal on 2020-04-23 (33 days ago)
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