[Samba] cannot update apt-get

[Bob of Donelson Trophy]

On my member server (Debian 7.8.0/Sernet Samba 4.2.2) when I run
"apt-get update" I am receiving the following: 

Reading package lists... Done 
W: Duplicate sources.list entry
https://download.sernet.de/packages/samba/4.2/debian/ wheezy/main amd64
Packages
(/var/lib/apt/lists/download.sernet.de_packages_samba_4.2_debian_dists_wheezy_main_binary-amd64_Packages)
W: You may want to run apt-get update to correct these problems 

I have run "apt-get update" several times and still getting the same
result. 

As it is Sernet packages . . . suggestions? 
-- 

_______________________________ 

Bob Wooden of Donelson Trophy

615.885.2846
www.donelsontrophy.com [1]

"Everyone deserves an award!!"
 

Links:
------
[1] http://www.donelsontrophy.com