It looks like your extensions are experiencing a number of problems. Please open the 'Extensions' app and disable all extensions. Now log in again to see if the bug still occurs.
Also... Thank you for taking the time to report this bug and helping to make Ubuntu better. It sounds like some part of the system has crashed. To help us find the cause of the crash please follow these steps: 1. Look in /var/crash for crash files and if found run: ubuntu-bug YOURFILE.crash Then tell us the ID of the newly-created bug. 2. If step 1 failed then look at https://errors.ubuntu.com/user/ID where ID is the content of file /var/lib/whoopsie/whoopsie-id on the machine. Do you find any links to recent problems on that page? If so then please send the links to us. 3. If step 2 also failed then apply the workaround from bug 994921, reboot, reproduce the crash, and retry step 1. Please take care to avoid attaching .crash files to bugs as we are unable to process them as file attachments. It would also be a security risk for yourself. ** Changed in: gnome-shell (Ubuntu) Status: New => Incomplete -- 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/1942425 Title: Gnome shell crashes after locking screen Status in gnome-shell package in Ubuntu: Incomplete Bug description: After locking screen and logging back in gnome shell has crashed and there is nothing open in the sessin. ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: gnome-shell 3.36.9-0ubuntu0.20.04.2 ProcVersionSignature: Ubuntu 5.4.0-81.91-generic 5.4.128 Uname: Linux 5.4.0-81-generic x86_64 NonfreeKernelModules: nvidia_modeset nvidia ApportVersion: 2.20.11-0ubuntu27.18 Architecture: amd64 CasperMD5CheckResult: skip CurrentDesktop: GNOME Date: Thu Sep 2 15:43:27 2021 DisplayManager: sddm InstallationDate: Installed on 2019-09-16 (717 days ago) InstallationMedia: Kubuntu 19.04 "Disco Dingo" - Release amd64 (20190416) RelatedPackageVersions: mutter-common 3.36.9-0ubuntu0.20.04.1 SourcePackage: gnome-shell UpgradeStatus: Upgraded to focal on 2020-09-17 (350 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1942425/+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