gnome-shell does not use gnome-screensaver, it has its own builtin lockscreen (provided you are also using gdm)
Also Screen Lock is activated via <super>+L these days -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-screensaver in Ubuntu. https://bugs.launchpad.net/bugs/1389650 Title: Lock screen not working with Gnome 3 (gnome-shell) and Ubuntu 14.10 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/1389650/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs