Sometimes we need to edit system files of Linux and it requires to login as root user to gain full administrator privileges. Here is a step by step procedure to enable, login and disable root user account in Ubuntu 9.04 (Linux). However its not a good idea to login as a root account. For regular Linux accounts it is recommended to use sudo command in terminal to execute root commands as its more safer and reliable.
How To Login As A Root User
First you have to create a password for a root user. Use the following command to set a new password for a root user.
sudo passwd root
Now use the following command to find where gdm.conf is located
Use this command to edit gdm.conf
sudo gedit /etc/gdm/gdm.conf
Find AllowRoot=false in gdm.conf and change its value to AllowRoot=true
Click on the Save button and then close gdm.conf.
Restart Ubuntu to login as a root user.
Disable Root Account
You may use the following command to disable root account.
sudo passwd -l root
My Complete Terminal Log
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jaxov@ubuntu:~$ sudo passwd root
Enter new UNIX password:
Retype new UNIX password:
passwd: password updated successfully
jaxov@ubuntu:~$ locate gdm.conf
jaxov@ubuntu:~$ sudo gedit /etc/gdm/gdm.conf