Good news, i find the issue, the problem are the gnome extensions, back up your .local/share/gnome-shell/ data and erase all your extensions, restart the shell and try to lock screen (it works for me).
After, install one by one extensions and, for each, try lock screen since find the buggie extension. -- 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/1880337 Title: Screen lock won't work Status in gnome-shell package in Ubuntu: Confirmed Bug description: Screen lock won't work i focal. Used to work fine on Super-L and now what happens it freezes for awhile (suspect time out defined) and then blinks and comes back into windows session. --- ProblemType: Bug ApportVersion: 2.20.11-0ubuntu27 Architecture: amd64 CasperMD5CheckResult: skip CurrentDesktop: ubuntu:GNOME DistroRelease: Ubuntu 20.04 InstallationDate: Installed on 2020-04-08 (46 days ago) InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200402) Package: gdm3 3.34.1-1ubuntu1 PackageArchitecture: amd64 ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcVersionSignature: Ubuntu 5.4.0-31.35-generic 5.4.34 Tags: focal Uname: Linux 5.4.0-31-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo _MarkForUpload: True mtime.conffile..etc.gdm3.custom.conf: 2020-04-16T12:53:22.919694 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1880337/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
