Solved the problem by following the accepted comment on this post: https://askubuntu.com/questions/1242110/after-upgrading-to-ubuntu-20-04-lockscreen-not-working `$ sudo dpkg-reconfigure gdm3` -> Choose gdm3 Don't forget to reboot. Also, it seems the error message that the gdm service cannot be started after the reconfigure is normal.
Using lightdm instead of gdm3 is the cause of the problem here as it seems. Of course not a real fix, but a nice workaround. Hope this helps somebody. -- 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/1880785 Title: Cannot enable 'Lock screen on suspend' Status in gnome-shell package in Ubuntu: Confirmed 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) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1880785/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
