Update Manager arbeitet nicht mit Efika MX (Ubuntu Maverick)

Wenn ich versuche, mithilfe des Update-Managers zu aktualisieren, wird die folgende Fehlermeldung angezeigt:

Failed to download repository information: Check your Internet connection. W:Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/maverick/main/source/Sources.gz 404 Not Found, W:Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/maverick/restricted/source/Sources.gz 404 Not Found, W:Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/maverick/universe/source/Sources.gz 404 Not Found, W:Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/maverick/multiverse/source/Sources.gz 404 Not Found, W:Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/maverick/main/binary-armel/Packages.gz 404 Not Found, W:Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/maverick/restricted/binary-armel/Packages.gz 404 Not Found, W:Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/maverick/universe/binary-armel/Packages.gz 404 Not Found, W:Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/maverick/multiverse/binary-armel/Packages.gz 404 Not Found, W:Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/maverick-updates/main/source/Sources.gz 404 Not Found, W:Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/maverick-updates/restricted/source/Sources.gz 404 Not Found, W:Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/maverick-updates/universe/source/Sources.gz 404 Not Found, W:Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/maverick-updates/multiverse/source/Sources.gz 404 Not Found, W:Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/maverick-updates/main/binary-armel/Packages.gz 404 Not Found, W:Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/maverick-updates/restricted/binary-armel/Packages.gz 404 Not Found, W:Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/maverick-updates/universe/binary-armel/Packages.gz 404 Not Found, W:Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/maverick-updates/multiverse/binary-armel/Packages.gz 404 Not Found, W:Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/maverick-security/main/source/Sources.gz 404 Not Found, W:Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/maverick-security/restricted/source/Sources.gz 404 Not Found, W:Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/maverick-security/universe/source/Sources.gz 404 Not Found, W:Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/maverick-security/multiverse/source/Sources.gz 404 Not Found, W:Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/maverick-security/main/binary-armel/Packages.gz 404 Not Found, W:Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/maverick-security/restricted/binary-armel/Packages.gz 404 Not Found, W:Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/maverick-security/universe/binary-armel/Packages.gz 404 Not Found, W:Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/maverick-security/multiverse/binary-armel/Packages.gz 404 Not Found, E:Some index files failed to download, they have been ignored, or old ones used instead. 

Ich weiß, dass Maverick eine alte und nicht unterstützte Version ist, aber ich kann kein Upgrade auf eine neue Version durchführen, da Efika MX sie nicht unterstützt. Ich habe versucht, "port.ubuntu.com" durch "old-releases.ubuntu.com" zu ersetzen (wie von einigen Websites empfohlen), aber es funktioniert auch nicht.

Welche Konfiguration muss ich ändern, damit die Updates ordnungsgemäß funktionieren?