Ubuntu modification allows root to log in directly

Ubuntu does not allow root to log in directly by default. We need to do sodo. Doing it like this is a waste of time and very annoying, right? Let's modify it so that Ubuntu allows users to log in directly using the root account.

1. Change the root password: sudo passwd root

2. Modify the ssh configuration: sudo vi /etc/ssh/sshd_config, find the PermitRootLogin item and change it to yes, save and exit and restart the ssh service, sudo service ssh restart.

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