Fichier d'index

Bonjour,
J'ai installé ubuntu 14.10 il y a de cela 1h et je rencontre déjà un problème, je n'arrive pas a télécharger des applications via le terminal ,j'ai la ligne : " E: Le téléchargement de quelques fichiers d'index a échoué, ils ont été ignorés, ou les anciens ont été utilisés à la place."

J'ai vu sur les forums que l'erreur viendrait peut être du source list , voici le mien :"
# deb cdrom:[Ubuntu 14.10 _Utopic Unicorn_ - Release amd64 (20141022.1)]/ utopic main restricted

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://fr.archive.ubuntu.com/ubuntu/ utopic main restricted
deb-src http://fr.archive.ubuntu.com/ubuntu/ utopic main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb http://fr.archive.ubuntu.com/ubuntu/ utopic-updates main restricted
deb-src http://fr.archive.ubuntu.com/ubuntu/ utopic-updates main restricted

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://fr.archive.ubuntu.com/ubuntu/ utopic universe
deb-src http://fr.archive.ubuntu.com/ubuntu/ utopic universe
deb http://fr.archive.ubuntu.com/ubuntu/ utopic-updates universe
deb-src http://fr.archive.ubuntu.com/ubuntu/ utopic-updates universe

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://fr.archive.ubuntu.com/ubuntu/ utopic multiverse
deb-src http://fr.archive.ubuntu.com/ubuntu/ utopic multiverse
deb http://fr.archive.ubuntu.com/ubuntu/ utopic-updates multiverse
deb-src http://fr.archive.ubuntu.com/ubuntu/ utopic-updates multiverse

## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://fr.archive.ubuntu.com/ubuntu/ utopic-backports main restricted universe multiverse
deb-src http://fr.archive.ubuntu.com/ubuntu/ utopic-backports main restricted universe multiverse

deb http://security.ubuntu.com/ubuntu utopic-security main restricted
deb-src http://security.ubuntu.com/ubuntu utopic-security main restricted
deb http://security.ubuntu.com/ubuntu utopic-security universe
deb-src http://security.ubuntu.com/ubuntu utopic-security universe
deb http://security.ubuntu.com/ubuntu utopic-security multiverse
deb-src http://security.ubuntu.com/ubuntu utopic-security multiverse

## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
deb http://archive.canonical.com/ubuntu utopic partner
deb-src http://archive.canonical.com/ubuntu utopic partner

## This software is not part of Ubuntu, but is offered by third-party
## developers who want to ship their latest software.
deb http://extras.ubuntu.com/ubuntu utopic main
deb-src http://extras.ubuntu.com/ubuntu utopic main


y'a t-il une erreur ?
ou bien c'est totalement autre chose ?

Merci :)