I was having the same fail/mistake but in Ubuntu 18.04 (Gnome and vanilla desktop), I don't know why but since 2 weeks ago (since an update of gnome-control-center I think, but I'm not sure) the lock screen just doesn't work and neither the settings, it's like zhiwei said, it doesn't allow any changes.
But doing this: "gsettings set org.gnome.desktop.lockdown disable-lock-screen false" Now works. Thanks, srsly. I was searching since two weeks without any results. I add this comment if anyone has this fail too. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-screensaver in Ubuntu. https://bugs.launchpad.net/bugs/864458 Title: screensaver doesn't work Status in gnome-screensaver package in Ubuntu: Invalid Bug description: "gnome-screensaver-command -l" shows nothing happened. And screen setting in system settings are unclickable. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/864458/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
