root@debian9:/home/xy# apt-get update
OK:1 http://security.debian.org stable/updates InRelease
OK:2 http://security.debian.org stretch/updates InRelease                      
Ign:3 http://ftp.de.debian.org/debian stretch InRelease                        
OK:4 http://ftp.de.debian.org/debian stable-updates InRelease                
OK:5 http://ftp.de.debian.org/debian stretch-updates InRelease
OK:6 http://ftp.de.debian.org/debian stretch Release
Holen:8 http://ftp.de.debian.org/debian stretch/non-free Sources [79,7 kB]
Holen:9 http://ftp.de.debian.org/debian stretch/contrib Sources [44,7 kB]
Holen:10 http://ftp.de.debian.org/debian stretch/contrib i386 Packages [47,9 kB]
Holen:11 http://ftp.de.debian.org/debian stretch/contrib Translation-en [45,9 kB]
Holen:12 http://ftp.de.debian.org/debian stretch/contrib i386 DEP-11 Metadata [7.332 B]
Holen:13 http://ftp.de.debian.org/debian stretch/contrib DEP-11 64x64 Icons [100 kB]
Holen:14 http://ftp.de.debian.org/debian stretch/non-free i386 Packages [68,9 kB]
Holen:15 http://ftp.de.debian.org/debian stretch/non-free Translation-en [79,2 kB]
Holen:16 http://ftp.de.debian.org/debian stretch/non-free i386 DEP-11 Metadata [7.472 B]
Holen:17 http://ftp.de.debian.org/debian stretch/non-free DEP-11 64x64 Icons [30,0 kB]
Es wurden 511 kB in 1 s geholt (302 kB/s).                           
Paketlisten werden gelesen... Fertig
W: Target Sources (main/source/Sources) is configured multiple times in /etc/apt/sources.list:13 and /etc/apt/sources.list:39
W: Target Packages (main/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:12 and /etc/apt/sources.list:38
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:12 and /etc/apt/sources.list:38
W: Target Translations (main/i18n/Translation-de_DE) is configured multiple times in /etc/apt/sources.list:12 and /etc/apt/sources.list:38
W: Target Translations (main/i18n/Translation-de) is configured multiple times in /etc/apt/sources.list:12 and /etc/apt/sources.list:38
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:12 and /etc/apt/sources.list:38
W: Target DEP-11 (main/dep11/Components-i386.yml) is configured multiple times in /etc/apt/sources.list:12 and /etc/apt/sources.list:38
W: Target DEP-11 (main/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:12 and /etc/apt/sources.list:38
W: Target DEP-11-icons (main/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:12 and /etc/apt/sources.list:38
W: Target Sources (main/source/Sources) is configured multiple times in /etc/apt/sources.list:13 and /etc/apt/sources.list:39
W: Target Packages (main/binary-i386/Packages) is configured multiple times in /etc/apt/sources.list:12 and /etc/apt/sources.list:38
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:12 and /etc/apt/sources.list:38
W: Target Translations (main/i18n/Translation-de_DE) is configured multiple times in /etc/apt/sources.list:12 and /etc/apt/sources.list:38
W: Target Translations (main/i18n/Translation-de) is configured multiple times in /etc/apt/sources.list:12 and /etc/apt/sources.list:38
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:12 and /etc/apt/sources.list:38
W: Target DEP-11 (main/dep11/Components-i386.yml) is configured multiple times in /etc/apt/sources.list:12 and /etc/apt/sources.list:38
W: Target DEP-11 (main/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:12 and /etc/apt/sources.list:38
W: Target DEP-11-icons (main/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:12 and /etc/apt/sources.list:38