Having successfully installed Knoppix 5.1.1 (following a download and subsequent ISO burn) on the 20GB HDD of a P3 laptop with max 256MB RAM ,each time I try to access services in KDE requiring the root password , for example when wishing to change the area time or any other services , the response is : Su returned with error.

This is my first encounter with a debian fork after having used the Mandriva distro.

Does someone know what the problem is and how to correct ?

TIA for any advice

Frank higlandham