How to make root account in ubuntu/Linux to get admin access without sudo

Open terminal and Write
$sudo passwd root
now enter sudo account password which you set initially
then Enter New UNIX(root) password and reEnter UNIX(root) Password
Now you can login as root account--
select "logout"/"switch user" then login as
USERNAME- root
Password- UNIX (root) password as u entered
And to change user in terminal write--
$su
now enter UNIX(root) password
now you have logged as root account...
if have any problem to execute plz write...