It returns "true" when I run this command. I resolved this problem by run this command: "gsettings set org.gnome.desktop.lockdown disable-lock-screen false"
I copied guest session's home dir(/tmp/GuestXXX/*) to administrator's dir(/home/admin/*) a few days ago, and this let admin account disabled lock_screen, because guest session has disabled the lock_screen function by default. Thank you for your help! -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/864458 Title: screensaver doesn't work To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/864458/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs