I don't believe there is a fix yet. Best workaround I've found is to purge the extension and install upstream as shown here https://github.com/micheleg/dash-to- dock/issues/649#issuecomment-424182892
** Bug watch added: github.com/micheleg/dash-to-dock/issues #649 https://github.com/micheleg/dash-to-dock/issues/649 -- 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