Thanks for the bug report. You seem to have found exactly the right existing bug reports but both of those are closed for the case of Gnome Shell on Ubuntu. So let's use this bug for now.
Next, please run this command to send us more information about the system: apport-collect 1800352 ** 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/1800352 Title: desktop and current applications displayed when resuming from lock Status in gnome-shell package in Ubuntu: Incomplete Bug description: after upgrade to ubuntu 18.10, when resuming from lock (eg re-opening laptop lid), before typing password (or indeed anything), the whole desktop including running apps is displayed. although they are not interactable/responsive, sensitive info is displayed. possibly related, super+l seems to put the desktop into a similar state - apps visible, but not interactable. pressing it a second time produces a more normal lock reaction. gnome-shell: Installed: 3.30.1-2ubuntu1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1800352/+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