In the Linux system root privileges it is very important, in many places it is impossible that you do not have permission to make changes. So here I will teach you how to get root in Ununtu in.
1. First create a root user, open a terminal and enter the command sudo passwd root
This time it will let you enter the current password for the account, the next step is the pop-up is to set the root password, it will let you enter it again to confirm, the password to remember
2. modify the configuration file, the file path of the file path /usr/share/lightdm/lightdm.conf.d/50-unity-greeter.conf
We directly use the Open command, you can use an editor like vim, enter
gedit /usr/share/lightdm/lightdm.conf.d/50-unity-greeter.conf
We need to enter at the end of
greeter-show-manual-login = true
all-guest = false
3. Remove gdm login user testing, modification /etc/pam.d/gdm-autologin file
Enter the command gedit /etc/pam.d/gdm-autologin
Delete the contents or comment below, with the comment symbol #
auth required pam_succeed_if.so user != root quiet_success
4. Modify /etc/pam.d/gdm-password file,
gedit /etc/pam.d/gdm-password same delete or comment out the above statement
5. Modify /root/.profile
gedit /root/.profile
The last line of the document before mesg n || true added tty -s && That tty -s && mesg n || true
6. restart the system, the terminal interface input #reboot
After the reboot is complete, the login screen select the "unlisted", then enter the user name root can log in