Chang Root Password Ubuntu
Chang the root password
$ sudu su
# passwd
Then the system will ask you to input your new password.
Categories: Ubuntu
Chang the root password
$ sudu su
# passwd
Then the system will ask you to input your new password.
There is no root password in Ubuntu by default, so your instructions are really for setting a root password, not changing it.
Also, there is no need to set a root password. If you want a persistent root prompt, the sudo su or sudo -i command will suffice.