I have just enabled proposed and upgraded to gnome-shell-extension-ubuntu-dock (63ubuntu1.18.10.2). The issue seems to be solved, but I believe it will need more time for testing.
I cannot believe such a high-severity bug has been around since early May, 2018, on both 18.04 LTS and 18.10. Shame on you Canonical!! -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1769383 Title: Ubuntu dock/launcher is shown on the lock screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1769383/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs