Installation qtiplot ubuntu

Bonjour,

j'essaie d'installer qtiplot sous ubuntu, mais je n'arrive pas à comprendre ces messages d'erreur
MERCI BEAUCOUP

~$ sudo apt-get install qtiplot
[sudo] password for yasmine:
Lecture des listes de paquets... Fait
Construction de l'arbre des dépendances
Lecture des informations d'état... Fait
Les paquets supplémentaires suivants seront installés :
libaudio2 libmuparser0 libmysqlclient15off liborigin0 libqt4-assistant
libqt4-dbus libqt4-designer libqt4-help libqt4-network libqt4-opengl
libqt4-qt3support libqt4-script libqt4-sql libqt4-sql-mysql libqt4-svg
libqt4-test libqt4-webkit libqt4-xml libqt4-xmlpatterns libqtcore4 libqtgui4
libqwt5-qt4 libqwtplot3d-qt4 mysql-common python-qt4 python-qt4-common
python-sip4 qt4-qtconfig
Paquets suggérés :
nas libqt4-dev python-qt4-dbg
Les NOUVEAUX paquets suivants seront installés :
libaudio2 libmuparser0 libmysqlclient15off liborigin0 libqt4-assistant
libqt4-dbus libqt4-designer libqt4-help libqt4-network libqt4-opengl
libqt4-qt3support libqt4-script libqt4-sql libqt4-sql-mysql libqt4-svg
libqt4-test libqt4-webkit libqt4-xml libqt4-xmlpatterns libqtcore4 libqtgui4
libqwt5-qt4 libqwtplot3d-qt4 mysql-common python-qt4 python-qt4-common
python-sip4 qt4-qtconfig qtiplot
0 mis à jour, 29 nouvellement installés, 0 à enlever et 361 non mis à jour.
Il est nécessaire de prendre 25,0Mo/25,7Mo dans les archives.
Après cette opération, 75,9Mo d'espace disque supplémentaires seront utilisés.
Souhaitez-vous continuer [O/n] ? O
ATTENTION : les paquets suivants n'ont pas été authentifiés.
libaudio2 mysql-common libmysqlclient15off liborigin0 libqtcore4
libqt4-network libqt4-assistant libqt4-xml libqt4-dbus libqt4-script
libqtgui4 libqt4-designer libqt4-sql libqt4-help libqt4-opengl
libqt4-qt3support libqt4-sql-mysql libqt4-svg libqt4-test libqt4-webkit
libqt4-xmlpatterns libqwt5-qt4 libqwtplot3d-qt4 python-sip4
python-qt4-common python-qt4 qt4-qtconfig libmuparser0 qtiplot
Faut-il installer ces paquets sans vérification (o/N) ? O
Err http://fr.archive.ubuntu.com intrepid/main libaudio2 1.9.1-4
404 Not Found
Err http://fr.archive.ubuntu.com intrepid-updates/main mysql-common 5.0.67-0ubuntu6.1
404 Not Found
Err https://ubuntu.com/security/notices intrepid-security/main mysql-common 5.0.67-0ubuntu6.1
404 Not Found [IP : 91.189.92.167 80]
Err http://fr.archive.ubuntu.com intrepid/main python-sip4 4.7.7-1
404 Not Found
Err http://fr.archive.ubuntu.com intrepid/main python-qt4-common 4.4.3-1ubuntu1
404 Not Found
Err http://fr.archive.ubuntu.com intrepid/main python-qt4 4.4.3-1ubuntu1
404 Not Found
Err https://ubuntu.com/security/notices intrepid-security/main libmysqlclient15off 5.0.67-0ubuntu6.1
404 Not Found [IP : 91.189.92.167 80]
Err https://ubuntu.com/security/notices intrepid-security/main libqtcore4 4.4.3-0ubuntu1.4
404 Not Found [IP : 91.189.92.167 80]
Err https://ubuntu.com/security/notices intrepid-security/main libqt4-network 4.4.3-0ubuntu1.4
404 Not Found [IP : 91.189.92.167 80]
Err https://ubuntu.com/security/notices intrepid-security/main libqt4-assistant 4.4.3-0ubuntu1.4
404 Not Found [IP : 91.189.92.167 80]
Err http://fr.archive.ubuntu.com intrepid/universe qtiplot 0.9.6.2-1
404 Not Found
Err https://ubuntu.com/security/notices intrepid-security/main libqt4-xml 4.4.3-0ubuntu1.4
404 Not Found [IP : 91.189.92.167 80]
Err https://ubuntu.com/security/notices intrepid-security/main libqt4-dbus 4.4.3-0ubuntu1.4
404 Not Found [IP : 91.189.92.167 80]
Err https://ubuntu.com/security/notices intrepid-security/main libqt4-script 4.4.3-0ubuntu1.4
404 Not Found [IP : 91.189.92.167 80]
Err https://ubuntu.com/security/notices intrepid-security/main libqtgui4 4.4.3-0ubuntu1.4
404 Not Found [IP : 91.189.92.167 80]
Err https://ubuntu.com/security/notices intrepid-security/main libqt4-designer 4.4.3-0ubuntu1.4
404 Not Found [IP : 91.189.92.167 80]
Err https://ubuntu.com/security/notices intrepid-security/main libqt4-sql 4.4.3-0ubuntu1.4
404 Not Found [IP : 91.189.92.167 80]
Err https://ubuntu.com/security/notices intrepid-security/main libqt4-help 4.4.3-0ubuntu1.4
404 Not Found [IP : 91.189.92.167 80]
Err https://ubuntu.com/security/notices intrepid-security/main libqt4-opengl 4.4.3-0ubuntu1.4
404 Not Found [IP : 91.189.92.167 80]
Err https://ubuntu.com/security/notices intrepid-security/main libqt4-qt3support 4.4.3-0ubuntu1.4
404 Not Found [IP : 91.189.92.167 80]
Err https://ubuntu.com/security/notices intrepid-security/main libqt4-sql-mysql 4.4.3-0ubuntu1.4
404 Not Found [IP : 91.189.92.167 80]
Err https://ubuntu.com/security/notices intrepid-security/main libqt4-svg 4.4.3-0ubuntu1.4
404 Not Found [IP : 91.189.92.167 80]
Err https://ubuntu.com/security/notices intrepid-security/main libqt4-test 4.4.3-0ubuntu1.4
404 Not Found [IP : 91.189.92.167 80]
Err https://ubuntu.com/security/notices intrepid-security/main libqt4-webkit 4.4.3-0ubuntu1.4
404 Not Found [IP : 91.189.92.167 80]
Err https://ubuntu.com/security/notices intrepid-security/main libqt4-xmlpatterns 4.4.3-0ubuntu1.4
404 Not Found [IP : 91.189.92.167 80]
Err https://ubuntu.com/security/notices intrepid-security/main qt4-qtconfig 4.4.3-0ubuntu1.4
404 Not Found [IP : 91.189.92.167 80]
Impossible de récupérer http://fr.archive.ubuntu.com/ubuntu/pool/main/n/nas/libaudio2_1.9.1-4_i386.deb 404 Not Found
Impossible de récupérer http://security.ubuntu.com/ubuntu/pool/main/m/mysql-dfsg-5.0/mysql-common_5.0.67-0ubuntu6.1_all.deb 404 Not Found [IP : 91.189.92.167 80]
Impossible de récupérer http://security.ubuntu.com/ubuntu/pool/main/m/mysql-dfsg-5.0/libmysqlclient15off_5.0.67-0ubuntu6.1_i386.deb 404 Not Found [IP : 91.189.92.167 80]
Impossible de récupérer http://security.ubuntu.com/ubuntu/pool/main/q/qt4-x11/libqtcore4_4.4.3-0ubuntu1.4_i386.deb 404 Not Found [IP : 91.189.92.167 80]
Impossible de récupérer http://security.ubuntu.com/ubuntu/pool/main/q/qt4-x11/libqt4-network_4.4.3-0ubuntu1.4_i386.deb 404 Not Found [IP : 91.189.92.167 80]
Impossible de récupérer http://security.ubuntu.com/ubuntu/pool/main/q/qt4-x11/libqt4-assistant_4.4.3-0ubuntu1.4_i386.deb 404 Not Found [IP : 91.189.92.167 80]
Impossible de récupérer http://security.ubuntu.com/ubuntu/pool/main/q/qt4-x11/libqt4-xml_4.4.3-0ubuntu1.4_i386.deb 404 Not Found [IP : 91.189.92.167 80]
Impossible de récupérer http://security.ubuntu.com/ubuntu/pool/main/q/qt4-x11/libqt4-dbus_4.4.3-0ubuntu1.4_i386.deb 404 Not Found [IP : 91.189.92.167 80]
Impossible de récupérer http://security.ubuntu.com/ubuntu/pool/main/q/qt4-x11/libqt4-script_4.4.3-0ubuntu1.4_i386.deb 404 Not Found [IP : 91.189.92.167 80]
Impossible de récupérer http://security.ubuntu.com/ubuntu/pool/main/q/qt4-x11/libqtgui4_4.4.3-0ubuntu1.4_i386.deb 404 Not Found [IP : 91.189.92.167 80]
Impossible de récupérer http://security.ubuntu.com/ubuntu/pool/main/q/qt4-x11/libqt4-designer_4.4.3-0ubuntu1.4_i386.deb 404 Not Found [IP : 91.189.92.167 80]
Impossible de récupérer http://security.ubuntu.com/ubuntu/pool/main/q/qt4-x11/libqt4-sql_4.4.3-0ubuntu1.4_i386.deb 404 Not Found [IP : 91.189.92.167 80]
Impossible de récupérer http://security.ubuntu.com/ubuntu/pool/main/q/qt4-x11/libqt4-help_4.4.3-0ubuntu1.4_i386.deb 404 Not Found [IP : 91.189.92.167 80]
Impossible de récupérer http://security.ubuntu.com/ubuntu/pool/main/q/qt4-x11/libqt4-opengl_4.4.3-0ubuntu1.4_i386.deb 404 Not Found [IP : 91.189.92.167 80]
Impossible de récupérer http://security.ubuntu.com/ubuntu/pool/main/q/qt4-x11/libqt4-qt3support_4.4.3-0ubuntu1.4_i386.deb 404 Not Found [IP : 91.189.92.167 80]
Impossible de récupérer http://security.ubuntu.com/ubuntu/pool/main/q/qt4-x11/libqt4-sql-mysql_4.4.3-0ubuntu1.4_i386.deb 404 Not Found [IP : 91.189.92.167 80]
Impossible de récupérer http://security.ubuntu.com/ubuntu/pool/main/q/qt4-x11/libqt4-svg_4.4.3-0ubuntu1.4_i386.deb 404 Not Found [IP : 91.189.92.167 80]
Impossible de récupérer http://security.ubuntu.com/ubuntu/pool/main/q/qt4-x11/libqt4-test_4.4.3-0ubuntu1.4_i386.deb 404 Not Found [IP : 91.189.92.167 80]
Impossible de récupérer http://security.ubuntu.com/ubuntu/pool/main/q/qt4-x11/libqt4-webkit_4.4.3-0ubuntu1.4_i386.deb 404 Not Found [IP : 91.189.92.167 80]
Impossible de récupérer http://security.ubuntu.com/ubuntu/pool/main/q/qt4-x11/libqt4-xmlpatterns_4.4.3-0ubuntu1.4_i386.deb 404 Not Found [IP : 91.189.92.167 80]
Impossible de récupérer http://fr.archive.ubuntu.com/ubuntu/pool/main/s/sip4-qt3/python-sip4_4.7.7-1_i386.deb 404 Not Found
Impossible de récupérer http://fr.archive.ubuntu.com/ubuntu/pool/main/p/python-qt4/python-qt4-common_4.4.3-1ubuntu1_all.deb 404 Not Found
Impossible de récupérer http://fr.archive.ubuntu.com/ubuntu/pool/main/p/python-qt4/python-qt4_4.4.3-1ubuntu1_i386.deb 404 Not Found
Impossible de récupérer http://security.ubuntu.com/ubuntu/pool/main/q/qt4-x11/qt4-qtconfig_4.4.3-0ubuntu1.4_i386.deb 404 Not Found [IP : 91.189.92.167 80]
Impossible de récupérer http://fr.archive.ubuntu.com/ubuntu/pool/universe/q/qtiplot/qtiplot_0.9.6.2-1_i386.deb 404 Not Found
E: Impossible de récupérer quelques archives, peut-être devrez-vous lancer apt-get update ou essayer avec --fix-missing ?