I had the same problem on ubuntu 18.04. Disabling the key "/org/gnome/desktop/lockdown/disable-lock-screen" in dconf-editor solved the problem.
-- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-shell in Ubuntu. https://bugs.launchpad.net/bugs/1715435 Title: Can't lock screen with keyboard shortcuts when using lightdm To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1715435/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
