Boa tarde amigo fiz o que você me aconselhou e veja o que aconteceu:
--2012-09-18 16:15:42-- http://www.medibuntu.org/sources.list.d/precise.list
Resolvendo
www.medibuntu.org (
www.medibuntu.org)... 88.191.127.22
Conectando-se a
www.medibuntu.org (
www.medibuntu.org)|88.191.127.22|:80... conectado.
A requisição HTTP foi enviada, aguardando resposta... 200 OK
Tamanho: 284 [text/plain]
Salvando em: “/etc/apt/sources.list.d/medibuntu.list”
100%[======================================>] 284 --.-K/s em 0s
2012-09-18 16:15:44 (63,5 MB/s) - “/etc/apt/sources.list.d/medibuntu.list” salvo [284/284]
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http://br.archive.ubuntu.com maverick-backports InRelease
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http://br.archive.ubuntu.com maverick-backports Release.gpg
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http://br.archive.ubuntu.com maverick-backports Release
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http://br.archive.ubuntu.com maverick-backports/main Sources
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http://br.archive.ubuntu.com maverick-backports/restricted Sources
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http://br.archive.ubuntu.com maverick-backports/multiverse Sources
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http://br.archive.ubuntu.com maverick-backports/main i386 Packages
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http://dl.google.com stable InRelease
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http://dl.google.com stable Release.gpg
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http://archive.ubuntu.com natty InRelease
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http://archive.ubuntu.com natty-updates InRelease
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http://archive.ubuntu.com natty-security InRelease
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http://security.ubuntu.com precise-security InRelease
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http://dl.google.com stable Release
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http://ppa.launchpad.net precise InRelease
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http://ppa.launchpad.net precise InRelease
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http://archive.canonical.com natty InRelease
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http://archive.canonical.com precise InRelease
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http://dl.google.com stable/main i386 Packages
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http://archive.ubuntu.com precise InRelease
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http://archive.ubuntu.com precise-updates InRelease
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http://archive.ubuntu.com precise-proposed InRelease
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http://archive.ubuntu.com precise-backports InRelease
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http://archive.ubuntu.com natty Release.gpg
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http://packages.medibuntu.org precise InRelease [7.096 B]
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http://security.ubuntu.com precise-security Release.gpg [198 B]
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http://dl.google.com stable/main TranslationIndex
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http://ppa.launchpad.net precise Release.gpg
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http://archive.canonical.com natty Release.gpg
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http://packages.medibuntu.org precise InRelease
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http://archive.ubuntu.com natty-updates Release.gpg [198 B]
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http://archive.ubuntu.com natty-security Release.gpg [198 B]
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http://archive.ubuntu.com precise Release.gpg
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http://archive.ubuntu.com precise-updates Release.gpg [198 B]
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http://archive.ubuntu.com precise-proposed Release.gpg [198 B]
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http://security.ubuntu.com precise-security Release [49,6 kB]
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http://ppa.launchpad.net precise Release.gpg
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http://archive.canonical.com precise Release.gpg
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http://archive.ubuntu.com precise-backports Release.gpg
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http://ppa.launchpad.net precise Release
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http://packages.medibuntu.org precise/free i386 Packages/DiffIndex
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http://archive.canonical.com natty Release
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http://archive.ubuntu.com natty Release
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http://archive.ubuntu.com natty-updates Release [39,8 kB]
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http://ppa.launchpad.net precise Release
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http://archive.canonical.com precise Release
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http://packages.medibuntu.org precise/non-free i386 Packages/DiffIndex
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http://security.ubuntu.com precise-security/restricted Sources [1.950 B]
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http://archive.canonical.com natty/partner Sources
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http://archive.canonical.com natty/partner i386 Packages
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http://archive.canonical.com natty/partner TranslationIndex
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http://archive.ubuntu.com natty-security Release [39,8 kB]
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http://security.ubuntu.com precise-security/main Sources [43,5 kB]
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http://ppa.launchpad.net precise/main Sources
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http://ppa.launchpad.net precise/main i386 Packages
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http://ppa.launchpad.net precise/main TranslationIndex
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http://archive.canonical.com precise/partner i386 Packages
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http://archive.ubuntu.com precise Release
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http://archive.ubuntu.com precise-updates Release [49,6 kB]
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http://security.ubuntu.com precise-security/multiverse Sources [1.386 B]
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http://security.ubuntu.com precise-security/universe Sources [13,5 kB]
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http://security.ubuntu.com precise-security/main i386 Packages [166 kB]
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http://packages.medibuntu.org precise/free i386 Packages
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http://archive.ubuntu.com precise-proposed Release [49,6 kB]
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http://archive.ubuntu.com precise-backports Release
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http://archive.ubuntu.com natty/main Sources
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http://archive.ubuntu.com natty/restricted Sources
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http://archive.ubuntu.com natty/universe Sources
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http://archive.ubuntu.com natty/multiverse Sources
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http://archive.ubuntu.com natty/main i386 Packages
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http://archive.ubuntu.com natty/universe i386 Packages
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http://archive.ubuntu.com natty/main TranslationIndex
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http://packages.medibuntu.org precise/non-free i386 Packages
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http://security.ubuntu.com precise-security/restricted i386 Packages [3.968 B]
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http://security.ubuntu.com precise-security/universe i386 Packages [44,2 kB]
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http://archive.ubuntu.com natty/multiverse TranslationIndex
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http://archive.ubuntu.com natty/restricted TranslationIndex
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http://archive.ubuntu.com natty/universe TranslationIndex
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http://archive.ubuntu.com natty-updates/main Sources [171 kB]
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http://security.ubuntu.com precise-security/multiverse i386 Packages [2.369 B]
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http://security.ubuntu.com precise-security/main TranslationIndex
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http://security.ubuntu.com precise-security/multiverse TranslationIndex
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http://security.ubuntu.com precise-security/restricted TranslationIndex
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http://security.ubuntu.com precise-security/universe TranslationIndex
Err
http://ppa.launchpad.net precise/main Sources
404 Not Found
Err
http://ppa.launchpad.net precise/main i386 Packages
404 Not Found
W: Erro GPG:
http://packages.medibuntu.org precise InRelease: As assinaturas a seguir não puderam ser verificadas devido à chave pública não estar disponível: NO_PUBKEY 2EBC26B60C5A2783
W: Falhou ao buscar
http://ppa.launchpad.net/ubuntu-clamav/ppa/ubuntu/dists/precise/main/source/Sources 404 Not Found
W: Falhou ao buscar
http://ppa.launchpad.net/ubuntu-clamav/ppa/ubuntu/dists/precise/main/binary-i386/Packages 404 Not Found
E: Alguns arquivos index falharam ao ser baixados. Eles foram ignorados, ou cópias antigas são usadas ao invés.
continua não atualizando, o que devo fazer