1. Centos system
1. After logging in as an ordinary user, first create a password for the super user root.
2. Switch to the root user through the su command
3. Change the default login account of the file to root
Open /etc/gdm/custom.conf
vi /etc/gdm/custom.conf or nano /etc/gdm/custom.conf (depend on which command you are familiar with) )
Write under file [daemon] ( Note: Write under this, do not Invalid writing!):
AutomaticLoginEnable=True
AutomaticLogin=root
Then save it and restart Reboot.
2. Ubuntu system
1. Set a password for root and test login and exit
Open the terminal, open the root account, and set the password:
sudo passwd root
Test root user login
su -
After successful login, you can log out as a normal user to continue the subsequent operations
exit
2. Modify the contents of the 50-ubuntu.conf configuration file
File location/usr/share/lightdm/lightdm.conf.d/50-ubuntu.conf (if there is no such file, go to this directory to find a similar file)
sudo chmod 777 /usr/share/lightdm/lightdm.conf.d/50-ubuntu.conf
Add two lines of code at the end of the file
greeter-show-manual- login=true
all-guest=false
3. Modify the gdm-autologin and gdm-passwd files
Enter the /etc/pam.d folder and find the gdm-autologin and gdm-passwd files (if not, look for similar files)
sudo chmod 777 /etc/pam.d /gdm-autologin
sudo chmod 777 /etc/pam.d/gdm-password
Comment out the line auth required pam_success_if.so user!=root quiet_success in both files
Modify the /root/.profile file
Find the .profile file to be modified. This file is a hidden file. If not, check the option box
Enable root permissions, open the file, comment out the last line, and then add another line
tty -s&&mesg n || true
4. Find the custom.conf configuration file and modify it
The folder path is /etc/gdm3/ (if not, find a similar folder, for example: /gdm)
Modify files
TimedLoginEnable=false
AutomaticLoginEnable=true #设为true
TimedLogin=root #设成root
AutomaticLogin=root #设成root
TimedLoginDelay=10
AutomaticLoginEnable=true #Set to true
AutomaticLogin=root #Set to root
