Build-Essential kann nicht auf Ubuntu Jaunty 9.04 installiert werden

Hier ist meine /etc/apt/sources.list:

#deb cdrom:[Ubuntu 9.04 _Jaunty Jackalope_ - Release i386 (20090420.1)]/ jaunty main restricted # See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to # newer versions of the distribution.  deb http://us.archive.ubuntu.com/ubuntu/ jaunty main restricted deb-src http://us.archive.ubuntu.com/ubuntu/ jaunty main restricted  ## Major bug fix updates produced after the final release of the ## distribution. deb http://us.archive.ubuntu.com/ubuntu/ jaunty-updates main restricted deb-src http://us.archive.ubuntu.com/ubuntu/ jaunty-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://us.archive.ubuntu.com/ubuntu/ jaunty universe deb-src http://us.archive.ubuntu.com/ubuntu/ jaunty universe deb http://us.archive.ubuntu.com/ubuntu/ jaunty-updates universe deb-src http://us.archive.ubuntu.com/ubuntu/ jaunty-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://us.archive.ubuntu.com/ubuntu/ jaunty multiverse deb-src http://us.archive.ubuntu.com/ubuntu/ jaunty multiverse deb http://us.archive.ubuntu.com/ubuntu/ jaunty-updates multiverse deb-src http://us.archive.ubuntu.com/ubuntu/ jaunty-updates multiverse  ## 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://us.archive.ubuntu.com/ubuntu/ jaunty-backports main restricted universe multiverse # deb-src http://us.archive.ubuntu.com/ubuntu/ jaunty-backports main restricted universe 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 jaunty partner # deb-src http://archive.canonical.com/ubuntu jaunty partner  deb http://security.ubuntu.com/ubuntu jaunty-security main restricted deb-src http://security.ubuntu.com/ubuntu jaunty-security main restricted deb http://security.ubuntu.com/ubuntu jaunty-security universe deb-src http://security.ubuntu.com/ubuntu jaunty-security universe deb http://security.ubuntu.com/ubuntu jaunty-security multiverse deb-src http://security.ubuntu.com/ubuntu jaunty-security multiverse 

Ich habe versucht sudo apt-get install build-essential, die Ergebnisse in E: Paket-Essential konnte nicht gefunden werden

und

sudo apt-get update && sudo apt-get install build-essentialwas zu mehreren Err http://us.archive.ubuntu.com führt. jaunty-updates / multiverse Sources 404 Not Found [IP: 91.189.88.140 80] und W: Fehler beim Abruf von http://security.ubuntu.com/ubuntu / dists / jaunty-security / main / binary-i386 / Packages 404 Not Found [IP: 91.189.92.166 80] Fehler

Irgendwelche Ideen?