salut ,

Tout nouveau dans linux , j'ai installé Kubuntu 6.06 et j'ai des pb pour lire les fichiers mp3 et video; je suis dans un lan avec un proxy.
Après quelques recherches et tutos j'ai activé les depots Universe et Multiverse, Canonical Commercial et Medibuntu
Lorsque que je fait "sudo apt-get update" je reçois l'erreur suivante :

Err http://kubuntu.org dapper Release.gpg
Connexion à kubuntu.org: 80 (82.211.81.158) impossible, délai de connexion dép assé
Err http://fr.packages.medibuntu.org dapper Release.gpg
Connexion à fr.packages.medibuntu.org: 80 (88.191.42.241) impossible, délai de connexion dépassé
Err http://archive.canonical.com dapper-commercial Release.gpg
Connexion à archive.canonical.com: 80 (82.211.81.142) impossible, délai de con nexion dépassé
Err http://kubuntu.org dapper Release.gpg
Connexion à kubuntu.org: 80 (82.211.81.158) impossible, délai de connexion dép assé
Err http://kubuntu.org dapper Release.gpg
Connexion à kubuntu.org: 80 (82.211.81.158) impossible, délai de connexion dép assé
Err http://archive.ubuntu.com dapper Release.gpg
Connexion à archive.ubuntu.com: 80 (91.189.89.8) impossible, délai de connexio n dépassé

Visiblement la commande apt-get n'arrive pas à se connecter à internet pour la recuperation des paquets...?
Konqueror se connecte sans pb au net.
Que puis-je faire pour remedier à ce pb?
Aide svp.

voici mon sources.list

# Line commented out by installer because it failed to verify:
#deb http://be.archive.ubuntu.com/ubuntu/ dapper main restricted
# Line commented out by installer because it failed to verify:
#deb-src http://be.archive.ubuntu.com/ubuntu/ dapper main restricted

## Major bug fix updates produced after the final release of the
## distribution.
# Line commented out by installer because it failed to verify:
#deb http://be.archive.ubuntu.com/ubuntu/ dapper-updates main restricted
# Line commented out by installer because it failed to verify:
#deb-src http://be.archive.ubuntu.com/ubuntu/ dapper-updates main restricted

## Uncomment the following two lines to add software from the 'universe'
## repository.
## 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
## universe WILL NOT receive any review or updates from the Ubuntu security
## team.
# deb http://be.archive.ubuntu.com/ubuntu/ dapper universe
# deb-src http://be.archive.ubuntu.com/ubuntu/ dapper universe

## Uncomment the following two lines to add software from the 'backports'
## repository.
## 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://be.archive.ubuntu.com/ubuntu/ dapper-backports main restricted universe multiverse
# deb-src http://be.archive.ubuntu.com/ubuntu/ dapper-backports main restricted universe multiverse

# Line commented out by installer because it failed to verify:
#deb http://security.ubuntu.com/ubuntu dapper-security main
# Line commented out by installer because it failed to verify:
#deb-src http://security.ubuntu.com/ubuntu dapper-security main
# deb http://security.ubuntu.com/ubuntu dapper-security universe
# deb-src http://security.ubuntu.com/ubuntu dapper-security universe

## SERVEURS INTERNATIONAUX
deb http://archive.ubuntu.com/ubuntu/ dapper main restricted
deb http://archive.ubuntu.com/ubuntu/ dapper-security main restricted
deb http://archive.ubuntu.com/ubuntu/ dapper-updates main restricted

# Dépôts de sources
deb-src http://archive.ubuntu.com/ubuntu/ dapper main restricted
deb-src http://archive.ubuntu.com/ubuntu/ dapper-updates main restricted
deb-src http://archive.ubuntu.com/ubuntu/ dapper-security main restricted
## SERVEURS INTERNATIONAUX
deb http://archive.ubuntu.com/ubuntu/ dapper main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ dapper-security main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ dapper-updates main restricted universe multiverse

# Dépôts de sources
deb-src http://archive.ubuntu.com/ubuntu/ dapper main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ dapper-updates main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ dapper-security main restricted universe multiverse

deb http://archive.canonical.com/ dapper-commercial main
## MEDIBUNTU
deb http://fr.packages.medibuntu.org/ dapper free non-free

# Sources
deb-src http://fr.packages.medibuntu.org/ dapper free non-free
## KUBUNTU PACKAGES
deb http://kubuntu.org/packages/kde-355 dapper main
deb http://kubuntu.org/packages/amarok-143 dapper main
deb http://kubuntu.org/packages/koffice-16 dapper main Configuration: DELL INPIRON Centrino Duo 1,66 | 1 Go Ram | 80 Go DD
Kubuntu 6.06 LTS
Konqueror 3.5