After additional research, I realized that this bug is invalid against accountsservice.
Instead, the bug is in Unity-Control-Center, which fails to change the login mode when locking an account. A user who is already in the nopasswordlogin group, therefore, will not be dropped from the nopasswordlogin group when the account is locked. I submitted a merge proposal at https://code.launchpad.net/~echaskes /unity-control-center/fix-user-password-dialog/+merge/217167 -- You received this bug notification because you are a member of DX Packages, which is subscribed to accountsservice in Ubuntu. Matching subscriptions: dx-packages https://bugs.launchpad.net/bugs/1169054 Title: Disabling then Re-Enabling login without password does remove user from nopasswdlogin group Status in “accountsservice” package in Ubuntu: Confirmed Bug description: I am using 12.04. Under System Settings, User Accounts, Passwords, Action, changing to "Login without a password" works as expected. On the next login, LightDM will not prompt you for a password, You can just login by hitting Enter. But, re-enabling password, or changing a password for the same user does not change LightDM behavior. LightDM does not re-enable asking for password at login. I think the problem is re-enabling password under Systems Settings does not delete user from nopasswdlogin group. You have to delete it from the command line: sudo gpasswd -d username nopasswdlogin This problem is the same ones described here: http://ubuntuforums.org/showthread.php?p=11566335 http://askubuntu.com/questions/211084/how-do-i-get-ubuntu-to-ask-me- for-at-password-at-login-again/281615#281615 http://askubuntu.com/questions/100010/no-password-asked-at-login- screen-just-start-session-button-with-lightdm To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/accountsservice/+bug/1169054/+subscriptions -- Mailing list: https://launchpad.net/~dx-packages Post to : dx-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~dx-packages More help : https://help.launchpad.net/ListHelp