Disfonctionnement de la debian apres mis à jour

Bonjour,
Apres mis a jour la debian 8 à la debian 9, je ne peux plus faire une mis a jour, en ligne de commande un:

#apt-get update
donne:

Atteint:1 http://security.debian.org stretch/updates InRelease
Ign:2 http://cdn-fastly.deb.debian.org/debian stretch InRelease                        
Atteint:3 http://cdn-fastly.deb.debian.org/debian stretch-updates InRelease            
Atteint:4 http://cdn-fastly.deb.debian.org/debian stretch Release     
Lecture des listes de paquets... Fait
W: Target Sources (main/source/Sources) is configured multiple times in /etc/apt/sources.list:8 and /etc/apt/sources.list:15
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list:7 and /etc/apt/sources.list:14
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:7 and /etc/apt/sources.list:14
W: Target Translations (main/i18n/Translation-fr_FR) is configured multiple times in /etc/apt/sources.list:7 and /etc/apt/sources.list:14
W: Target Translations (main/i18n/Translation-fr) is configured multiple times in /etc/apt/sources.list:7 and /etc/apt/sources.list:14
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:7 and /etc/apt/sources.list:14
W: Target DEP-11 (main/dep11/Components-amd64.yml) is configured multiple times in /etc/apt/sources.list:7 and /etc/apt/sources.list:14
W: Target DEP-11 (main/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:7 and /etc/apt/sources.list:14
W: Target DEP-11-icons (main/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:7 and /etc/apt/sources.list:14
W: Target DEP-11-icons-hidpi (main/dep11/icons-128x128.tar) is configured multiple times in /etc/apt/sources.list:7 and /etc/apt/sources.list:14
W: Target Sources (main/source/Sources) is configured multiple times in /etc/apt/sources.list:8 and /etc/apt/sources.list:15
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list:7 and /etc/apt/sources.list:14
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:7 and /etc/apt/sources.list:14
W: Target Translations (main/i18n/Translation-fr_FR) is configured multiple times in /etc/apt/sources.list:7 and /etc/apt/sources.list:14
W: Target Translations (main/i18n/Translation-fr) is configured multiple times in /etc/apt/sources.list:7 and /etc/apt/sources.list:14
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:7 and /etc/apt/sources.list:14
W: Target DEP-11 (main/dep11/Components-amd64.yml) is configured multiple times in /etc/apt/sources.list:7 and /etc/apt/sources.list:14
W: Target DEP-11 (main/dep11/Components-all.yml) is configured multiple times in /etc/apt/sources.list:7 and /etc/apt/sources.list:14
W: Target DEP-11-icons (main/dep11/icons-64x64.tar) is configured multiple times in /etc/apt/sources.list:7 and /etc/apt/sources.list:14
W: Target DEP-11-icons-hidpi (main/dep11/icons-128x128.tar) is configured multiple times in /etc/apt/sources.list:7 and /etc/apt/sources.list:14

Un:

vi /etc/apt/sources.list

donne:

deb http://httpredir.debian.org/debian stretch main contrib non-free
deb-src http://httpredir.debian.org/debian stretch main contrib non-free

deb http://httpredir.debian.org/debian stretch-updates main  contrib non-free
deb-src http://httpredir.debian.org/debian stretch-updates main contrib non-free

deb http://security.debian.org/ stretch/updates main contrib non-free
deb-src http://security.debian.org/ stretch/updates main contrib non-free 

# deb cdrom:[Debian GNU/Linux 8 _Jessie_ - Official Snapshot amd64 LIVE/INSTALL Binary 20150908-22:00]/ jessie main

#deb cdrom:[Debian GNU/Linux 8 _Jessie_ - Official Snapshot amd64 LIVE/INSTALL Binary 20150908-22:00]/ jessie main

deb http://security.debian.org/ stretch/updates main
deb-src http://security.debian.org/ stretch/updates main

Ma question: Comment remedier à ce problème ?

Salut
Ne pas dupliquer les lignes, utliser le cdrom comme cible et les sources c’est réservé aux experts

3 lignes doivent te suffire

deb http://httpredir.debian.org/debian stretch main contrib non-free
deb http://httpredir.debian.org/debian stretch-updates main contrib non-free
deb http://security.debian.org/ stretch/updates main contrib non-free

Même avis :
Voici mon sources, légèrement différents sur les débuts, au cas où :
deb http://ftp.fr.debian.org/debian/ stretch main contrib non-free
deb http://security.debian.org/ stretch/updates main contrib non-free
deb http://ftp.fr.debian.org/debian/ stretch-updates main contrib non-free

Désolé je n’ai pas vu le message que j’ai posté moi même.