Auto Root User Login Setting / Ubuntu 18.04 Environment

1. Setting Environment

The setting environment is as follows.

$ sudo passwd root
Enter new UNIX password:
Retype new UNIX password:

Set the root Password using the passwd tool.

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#%PAM-1.0
auth    requisite       pam-nologin.so
#auth   required        pam-succeed-if.so user != root quiet-success
...

[File 1] /etc/pam.d/gdm-password

Change the /etc/pam.d/gdm-password file to the contents of [File 1].

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#%PAM-1.0
auth    requisite       pam-nologin.so
#auth   required        pam-succeed-if.so user != root quiet-success
...

[File 2] /etc/pam.d/gdm-autologin

Change the /etc/pam.d/gdm-autologin file to the contents of [File 2].

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[daemon]
AutomaticLoginEnable=true
AutomaticLogin=root
...
[security]
AllowRoot=true

[File 3] /etc/gdm3/custom.conf

Create the /etc/lightdm/lightdm.conf file with the contents of [File 3]. (If the file already exists, modify it.)

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...

tty -s && mesg n

[File 4] /root/.profile

After rebooting, modify the contents of the /root/.profile file to the contents of [File 4].