Ubuntu root password

An article for those who do not know .

The Ubuntu developers decided that the root user is not needed. Instead, you need to use sudo with the password for the current account.
Because of this solution, to use the su command, you need to type in the console:
sudo passwd
and set a password for the root user, then this password can be used for su
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UPD (thanks to meako ): And you can sudo su and get a root terminal, with the password of the current user.
UPD (thanks to zloe_zlo ): And you can write sudo -i and become a superuser without su.