How to disable the login password for a specific user?

Question

I have two users in my Ubuntu Budgie 18.04.

The first is mine, and the second is for my mother.

I want to disable the login password request from my mother user, so she can log in without the need to remember a password. I tried simple passwords but the system also don't let me use simple passwords.

I also tried to activate the auto login, but it is annoying when I turn on my laptop to use My account, and it will log into my mother's user, and I need to log off to enter into mine.

The guest user also doesn't work, when I try to log in, it will go back to the login screen.

Answer 1

1.To keep a small password.

Change password on terminal sudo passwd username Enter whatever small password you like at prompt "Enter new UNIX password:"

And again type at prompt "Retype new UNIX password:"

Note: on terminal you will not see anything when you type the password.

2. To make totally password free:

   Run very carefully:

   sudo -H gedit /etc/sudoers
   

   add

   <username>   ALL=(ALL:ALL) NOPASSWD: ALL
   

   below the line

   %sudo   ALL=(ALL:ALL) ALL
   

   save and close.

and also:

Delete password for user:

sudo passwd -d <username>

Repeat the steps for other user.

3. To add to the group nopasswdlogin:

   sudo usermod -a -G nopasswdlogin <USERNAME>

4. To remove from nopasswdlogin group:

   sudo gpasswd -d <USERNAME> nopasswdlogin

Answer 2

Looking through logfiles, I found this (logged by lightdm): pam_succeed_if(lightdm:auth): requirement "user ingroup nopasswdlogin" not met by user "walt" (I use a password). Try adding your Mom to the nopasswdlogin group (sudo adduser Mom nopasswdlogin). Untested, might work.