In a terminal, I try to open kedit or kate, whatever, to edit a file such as /etc/apt/sources.list and get this:

root@knopbox:/home/dpucci# kedit /etc/apt/sources.list
Xlib: connection to ":0.0" refused by server
Xlib: No protocol specified

kedit: cannot connect to X server :0.0

Consequently I must open kedit as root and then hunt for the file to edit, etc.

What gives? Any help would be appreciated. I also use Mandrake with no problem, but I
prefer Knoppix/Debian.

Using Knoppix v. 3.4.