Ubuntu 17.04
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Use root account
2017/04/13
 
The root Account in Ubuntu is disabled by default because his password is not set. To use root priviledges, basically use the sudo command with administrative accounts. But if you'd like to use root Account by some reason, it's possible to use like follows.
[1] The user account added during installation is set an administrative account with Sudo, so it's easy to get root account's shell like follows.
ubuntu@dlp:~$
sudo -s

[sudo] password for ubuntu:
# own password

root@dlp:~#
# switched

[2] Or it's possible to switch to root account with standard su command to set root account's password.
ubuntu@dlp:~$
sudo passwd root

[sudo] password for ubuntu:
# own password

Enter new UNIX password:
# set root password

Retype new UNIX password:
# confirm

passwd: password updated successfully
ubuntu@dlp:~$
su -

Password:
# input root password

root@dlp:~#
# switched

*
The examples on this site shows as a root account. If you use Sudo, add "sudo" on the head of commands.
It had better to restrict users who can su to root if you enable root account. For using by Sudo, it's possible to limit to prohibit shells in sudoers config, refer to details about Sudo Settings.
[3] For su command restriction, set like follows.
root@dlp:~#
vi /etc/pam.d/su
# line 15: uncomment and add a group which is allow to do su command

auth   required   pam_wheel.so  
group=adm
root@dlp:~#
usermod -G adm ubuntu

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