Interesting. It might be a bug in one of those (standard Ubuntu extensions). It might also be an old extensions hiding in:
~/.local/share/gnome-shell/extensions/ (please look) ** Also affects: gnome-shell-extension-ubuntu-dock (Ubuntu) Importance: Undecided Status: New ** Also affects: gnome-shell-extension-appindicator (Ubuntu) Importance: Undecided Status: New ** Changed in: gdm3 (Ubuntu) Status: New => Incomplete ** Changed in: gnome-shell (Ubuntu) Status: New => Incomplete ** Changed in: gnome-shell-extension-appindicator (Ubuntu) Status: New => Incomplete ** Changed in: gnome-shell-extension-ubuntu-dock (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1803807 Title: Lock screen doesn't hide the screen contents To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1803807/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs