Question

I used this cmd to add a new user and a new group.

# groupadd lfs
# useradd -s /bin/bash -g lfs -m -k /dev/null lfs
# su lfs
$ passwd
Changing password for lfs.
(current) UNIX password: 

Then no matter what password I typed (my root passwd, or a completely new one), they all failed.

$ passwd
Changing password for lfs.
(current) UNIX password: 
passwd: Authentication token manipulation error
passwd: password unchanged

What’s wrong with my setting ? How can I set the passwd successfully ? Thanks !

Answer 1

Become root and then change the password. It won’t ask for current password.

su
passwd lfs