[gedit-list] Scheffler gedit problem

[Harald Scheffler <hu scheffler yahoo de>]

harald debian:~$ su
Passwort: 
root debian:/home/harald# gedit /etc/apt/sources.list

(gedit:4235): EggSMClient-WARNING **: Failed to connect to the session
manager: None of the authentication protocols specified are supported


** (gedit:4235): WARNING **: Could not connect to session bus
root debian:/home/harald# 


System:
Debian 7.1 wheezy 32 bit
kernel Linux 3.2.0.4-686-pae
Gnome 3.4.2

Speicher 11.9 GB
Processor Intel Core i5 CPU 760 2 8 GHz x 4

Problem: Can't open sources.list in /etc/apt/sources.list! see above!!