Erro de atualização ubuntu

[Pão Man]

Galera já tentei algumas coisas, mas não conseguir resolver esse erro, ainda não identifiquei...

W: Falhou ao buscar http://ppa.launchpad.net/zeitgeist/ppa/ubuntu/dists/precise/main/source/Sources  404  Not Found

W: Falhou ao buscar http://ppa.launchpad.net/zeitgeist/ppa/ubuntu/dists/precise/main/binary-amd64/Packages  404  Not Found

W: Falhou ao buscar http://ppa.launchpad.net/zeitgeist/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.

Não estou conseguindo atualizar...

Minha source.list

# deb cdrom:[Ubuntu 12.04 LTS _Precise Pangolin_ - Release amd64 (20120425)]/ dists/precise/main/binary-i386/

# deb cdrom:[Ubuntu 12.04 LTS _Precise Pangolin_ - Release amd64 (20120425)]/ dists/precise/restricted/binary-i386/
# deb cdrom:[Ubuntu 12.04 LTS _Precise Pangolin_ - Release amd64 (20120425)]/ precise main restricted

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://br.archive.ubuntu.com/ubuntu/ precise main restricted
deb-src http://br.archive.ubuntu.com/ubuntu/ precise main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb http://br.archive.ubuntu.com/ubuntu/ precise-updates main restricted
deb-src http://br.archive.ubuntu.com/ubuntu/ precise-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://br.archive.ubuntu.com/ubuntu/ precise universe
deb-src http://br.archive.ubuntu.com/ubuntu/ precise universe
deb http://br.archive.ubuntu.com/ubuntu/ precise-updates universe
deb-src http://br.archive.ubuntu.com/ubuntu/ precise-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://br.archive.ubuntu.com/ubuntu/ precise multiverse
deb-src http://br.archive.ubuntu.com/ubuntu/ precise multiverse
deb http://br.archive.ubuntu.com/ubuntu/ precise-updates multiverse
deb-src http://br.archive.ubuntu.com/ubuntu/ precise-updates multiverse

## 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://br.archive.ubuntu.com/ubuntu/ precise-backports main restricted universe multiverse
deb-src http://br.archive.ubuntu.com/ubuntu/ precise-backports main restricted universe multiverse

deb http://security.ubuntu.com/ubuntu precise-security main restricted
deb-src http://security.ubuntu.com/ubuntu precise-security main restricted
deb http://security.ubuntu.com/ubuntu precise-security universe
deb-src http://security.ubuntu.com/ubuntu precise-security universe
deb http://security.ubuntu.com/ubuntu precise-security multiverse
deb-src http://security.ubuntu.com/ubuntu precise-security 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 precise partner
# deb-src http://archive.canonical.com/ubuntu precise partner

## This software is not part of Ubuntu, but is offered by third-party
## developers who want to ship their latest software.
deb http://extras.ubuntu.com/ubuntu precise main
deb-src http://extras.ubuntu.com/ubuntu precise main

[Tota]

Ola

Vá em => Canais de Software e remova estes ppa's

Erro 404 significa que não existe o repositorio "precise". Confira aqui => http://ppa.launchpad.net/zeitgeist/ppa/ubuntu/dists

[]'s

[Metalbobolic]

Crie um source list robusto online e fácil

http://repogen.simplylinux.ch/

[Pão Man]

Opa valeu...

Eu também pensei nisso só que fiquei com medo de excluir.

Eu tirei duas ppas e agora esta beleza...