In this tutorial how to enable root login on the Ubuntu desktop. Sometime default Ubuntu not show root user login, so must be enable this manually.

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My Ubuntu 21.04 info:

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Server IP  : 10.66.100.6
OS  : Ubuntu 21.04
Disk   : 25 GB
RAM  : 2GB
vCPU   : 2
Service  : Ubuntu root login
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Step #01: Check server operating system and ip address.

tech@ubuntu21:~/Desktop$ lsb_release -a && ip r

Going to root user using sudo permission.

tech@ubuntu21:~$ sudo -i

Then type current user password and go to root user. Then setup root user password using below command.

root@ubuntu21:~# passwd

Open below file and allow root login true.

root@ubuntu21:~# vi /etc/gdm3/custom.conf

Insert below line into this custom.conf file.

AllowRoot=true

Step #02: Open another file and comment one line.

root@ubuntu21:~# vi /etc/pam.d/gdm-password

Comment below line.

#auth required pam_succeed_if.so user != root quiet_success

Now reboot your Ubuntu desktop and see Not listed? option.

root@ubuntu21:~# reboot

Now click on Not listed? and type root press Enter and then type root password.

If you see any error so please see my YouTube channel for more details.