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15.Set root user password
15.Set root user password
Input following command:
sudo passwd root
After executing this command, the system will prompt you to enter the root password twice. Just enter the password you want to set, and then execute
xxxxxxxxxxsudo passwd --unlock root
After executing this command, the system will prompt you to enter the root password twice. Just enter the password you want to set, and then execute
xxxxxxxxxxsu

The root user is successfully unlocked.