Upstream is now informed via https://github.com/ArcticaProject/arctica-greeter/issues/28 . I cited this bug there. Bastian Kanbach (bkanbach), you are welcome to add more comments there.
** Bug watch added: github.com/ArcticaProject/arctica-greeter/issues #28 https://github.com/ArcticaProject/arctica-greeter/issues/28 ** Bug watch added: github.com/canonical/lightdm/issues #214 https://github.com/canonical/lightdm/issues/214 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to the bug report. https://bugs.launchpad.net/bugs/1948339 Title: Logon screen can be bypassed using various shortcuts To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-mate/+bug/1948339/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs