Changing primary group on a user
 

Does anyone know how to change the primary group on a user without changing the password? I've tried updating the /etc/passwd and running usermod -g group user

Both of those does change the group but somehow it messes up the password so the user cannot get in with the same password.

Well one would say that manually changing the passwd file is never a good idea.
I have not heard of usermod performing any alteration to a users passwd.

have you performed only the usermod step alone to see if it still causes an issue?

Yea I know it's not a good idea to update the passwd file. I did the usermod first but either way it's not allowing the user to log in with their password.

Do you have the option to create a test account to try the same thing?
I changed mine twice without any issue.

Perhaps the user didn't remember their password correctly??

Yea does the same thing. Any idea where I can look to see why the password would change?

Not that I can think of, hopefully someone else will be able to help.

Out of curiosity,

1. which distro ?
2. Does the group exist?
3. Are you performing as root or using sudo?
4. i notice you are posting from Windows, is there a reason not from linux box?