Just guessing - this could be a leftover from when your phone was RW and you set the phone to not require a password/code and that got saved in /etc/ instead of in extrausers - and then the settings app couldn't do anything because the phone was RO.
** Changed in: unity8 (Ubuntu) Status: New => Incomplete ** Also affects: ubuntu-system-settings (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1571597 Title: No lock screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-system-settings/+bug/1571597/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs