There's a thread out here on how to login as root but I would advise you not to do so. As a Ubuntu user I myself use sudo command to work as root. This is more secure. I remember experienced linux users always saying that properly configured sudo completely eliminates the need to login as a root. And sudo in Kubuntu is configured to allow you to do everything using sudo command. So, you don't need to login as root. That is why root account is disabled.
Didn't sudo ever ask you for password so far?
'sudo ls' might have not given you any results as the present working directory ie the diretory your console is in right now is empty or has only hidden files.
DO try out other commands and tell us the results.
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