As default Ubuntu has no password set for the root user, i.e., the account named
root. To gain root privileges as another user you have to type in your own password. This is the password you set for the first user account while installing Ubuntu.
To set a password for the
root, run the following command in a Terminal shell:
sudo passwd root
After this you are asked to type in the new password twice. After this the
root account has its own password, so you can actually log in with the user name
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