I am getting below massge when I am trying to access root mode on Ubuntu Server.

UbuntuServer:~$ su root
Password: ******
su: Authentication failure
Sorry.

Actullay, you didn't set root password while we were installing Ubuntu server. You can type "sudo passwd root" and create a new password for root account.

UbuntuServer:~$ sudo passwd root
Enter new UNIX password: ******
Retype new UNIX password: ******
passwd: password updated successfully

Now, you have new root's password.

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