Comment 3 for bug 1282597

1. Start the Gnome-Terminal. You get 'user@host:~> ' .
2. Type 'su' , then you get the call to give your root password.
3. I type my root password, which I use as superuser (fixed by installing Ubuntu-system as root and log in to the operating system Ubuntu!).
4. I get the alert: 'Error with authenticity'(of the user, in German: 'Fehler bei der Authentifizierung').

I tried it with the order 'sudo su'. Here I get the entry as root (superuser 'root@host:~> ')!
But 'sudo' is an order for only a time limit (or helps 'sudo -v su'?). A little circumstantial.
In earlier versions of Ubuntu like the Ubuntu-version 12.04 LTS and also Suse Linux you need only the order 'su' and your root-password for entering as superuser for unlimited time.