I just have managed to install Lubuntu 12.04. Now I want to do some things in the terminal like installing and configuring the Apache and a Lamp-system among other things.
I come from Open SUSE world and there, I usually get access to the super-user-mode in the terminal by typing the command
But if I do that in Lubuntu, I am asked for the password and when I enter my password that I use to access the system, I get this error message (translated from German):
su: error with the Authentication
What should I do now?