The root account on an Ubuntu machine is normally disabled. This is how to enable the root account to use this Linux account like a traditional Linux system.
Firstly, enable the root account by setting a new password.
ubuntu ~ $ sudo passwd root Enter new UNIX password: Retype new UNIX password: passwd: password updated successfully
Then you may login to the root account as normal.
ubuntu ~ $ su Password: [email protected]:/home/ubuntu#
That is how easy this is.
The way to lock the root account again is to execute this command.
ubuntu ~ $ sudo passwd -l root passwd: password expiry information changed.
That will lock the root account again.