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Curtice Gough
Asked: 2017-06-16 16:55:10 +0800 CST

Cannot login with a password

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I am running Ubuntu 16.04.2 LTS on an iMac. I am the administrator of six users, and none of them can login with a password. Only the administrators with sudo privs can use a password. When you try to change the password through Settings > Users and Groups, it successfully changes the password, but when you log out and try to log in again, it doesn't ask for a password and just logs in when you click the user name. This is also the case when I use the passwd command through the terminal.

user@ubuntu-imac:~$ passwd
Changing password for user.
(current) UNIX password: 
Enter new UNIX password: 
Retype new UNIX password: 
passwd: password updated successfully

How do I fix this?

16.04

1 Answers

  1. Best Answer

    The lightdm GUI display manager allows users to login without providing their UNIX account password if they are members of the nopasswdlogin group.

    You can check which users are members of the group using getent e.g.

    getent group nopasswdlogin

    You can remove users from the group a number of ways - IMHO the gpasswd utility is the most straightforward e.g.

    sudo gpasswd --delete carol nopasswdlogin

    Alternatively, set the group membership to s specific list of allowed users using the -M (--members) switch:

    sudo gpasswd --members alice,bob nopasswdlogin

    You can remove all users from the group (thereby requiring all users to supply their UNIX passwords for GUI login) by setting the group membership to an empty list i.e.

    sudo gpasswd -M '' nopasswdlogin

    See man gpasswd.

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