Erro ao atualizar repositorios

[paulo.bsas]

Oi galera, nao sei se alguem pode me ajudar estou com problemas na atualização dos repositorios, tanto pelo terminal como pelo Synaptic esta dando uma mensagem de erro.
ja tentei ir a canais de software e mudar o servidor "melhor servidor" mas mesmo assim continua o mesmo problema e com isso nao estou conseguindo nem instalar qualquer tipo de programa porque diz arquivo nao encontrado.
se alguem souber a solução agradeceria!

aqui passo a mensagem de erro que me aparece no Terminal:

ubuntu@ubuntu-desktop:~$ sudo apt-get update
Ign http://br.archive.ubuntu.com feisty Release.gpg
Ign http://br.archive.ubuntu.com feisty/main Translation-pt_BR
Ign http://br.archive.ubuntu.com feisty/restricted Translation-pt_BR
Ign http://br.archive.ubuntu.com feisty/universe Translation-pt_BR
Ign http://br.archive.ubuntu.com feisty/multiverse Translation-pt_BR
Ign http://br.archive.ubuntu.com feisty-updates Release.gpg
Ign http://br.archive.ubuntu.com feisty-updates/main Translation-pt_BR
Ign http://br.archive.ubuntu.com feisty-updates/restricted Translation-pt_BR
Ign http://br.archive.ubuntu.com feisty-security Release.gpg
Ign http://br.archive.ubuntu.com feisty-security/main Translation-pt_BR
Ign http://br.archive.ubuntu.com feisty-security/restricted Translation-pt_BR
Ign http://br.archive.ubuntu.com feisty-security/universe Translation-pt_BR
Ign http://br.archive.ubuntu.com feisty-security/multiverse Translation-pt_BR
Ign http://br.archive.ubuntu.com feisty Release
Ign http://br.archive.ubuntu.com feisty-updates Release
Ign http://br.archive.ubuntu.com feisty-security Release
Ign http://br.archive.ubuntu.com feisty/main Packages
Ign http://br.archive.ubuntu.com feisty/restricted Packages
Ign http://br.archive.ubuntu.com feisty/restricted Sources
Ign http://br.archive.ubuntu.com feisty/main Sources
Ign http://br.archive.ubuntu.com feisty/multiverse Sources
Ign http://br.archive.ubuntu.com feisty/universe Sources
Ign http://br.archive.ubuntu.com feisty/universe Packages
Ign http://br.archive.ubuntu.com feisty/multiverse Packages
Ign http://br.archive.ubuntu.com feisty-updates/main Packages
Ign http://br.archive.ubuntu.com feisty-updates/restricted Packages
Ign http://br.archive.ubuntu.com feisty-updates/main Sources
Ign http://br.archive.ubuntu.com feisty-updates/restricted Sources
Ign http://br.archive.ubuntu.com feisty-security/main Packages
Ign http://br.archive.ubuntu.com feisty-security/restricted Packages
Ign http://br.archive.ubuntu.com feisty-security/restricted Sources
Ign http://br.archive.ubuntu.com feisty-security/main Sources
Ign http://br.archive.ubuntu.com feisty-security/multiverse Sources
Ign http://br.archive.ubuntu.com feisty-security/universe Sources
Ign http://br.archive.ubuntu.com feisty-security/universe Packages
Ign http://br.archive.ubuntu.com feisty-security/multiverse Packages
Err http://br.archive.ubuntu.com feisty/main Packages
  404 Not Found [IP: 200.17.202.1 80]
Err http://br.archive.ubuntu.com feisty/restricted Packages
  404 Not Found [IP: 200.17.202.1 80]
Err http://br.archive.ubuntu.com feisty/restricted Sources
  404 Not Found [IP: 200.17.202.1 80]
Err http://br.archive.ubuntu.com feisty/main Sources
  404 Not Found [IP: 200.17.202.1 80]
Err http://br.archive.ubuntu.com feisty/multiverse Sources
  404 Not Found [IP: 200.17.202.1 80]
Err http://br.archive.ubuntu.com feisty/universe Sources
  404 Not Found [IP: 200.17.202.1 80]
Err http://br.archive.ubuntu.com feisty/universe Packages
  404 Not Found [IP: 200.17.202.1 80]
Err http://br.archive.ubuntu.com feisty/multiverse Packages
  404 Not Found [IP: 200.17.202.1 80]
Err http://br.archive.ubuntu.com feisty-updates/main Packages
  404 Not Found [IP: 200.17.202.1 80]
Err http://br.archive.ubuntu.com feisty-updates/restricted Packages
  404 Not Found [IP: 200.17.202.1 80]
Err http://br.archive.ubuntu.com feisty-updates/main Sources
  404 Not Found [IP: 200.17.202.1 80]
Err http://br.archive.ubuntu.com feisty-updates/restricted Sources
  404 Not Found [IP: 200.17.202.1 80]
Err http://br.archive.ubuntu.com feisty-security/main Packages
  404 Not Found [IP: 200.17.202.1 80]
Err http://br.archive.ubuntu.com feisty-security/restricted Packages
  404 Not Found [IP: 200.17.202.1 80]
Err http://br.archive.ubuntu.com feisty-security/restricted Sources
  404 Not Found [IP: 200.17.202.1 80]
Err http://br.archive.ubuntu.com feisty-security/main Sources
  404 Not Found [IP: 200.17.202.1 80]
Err http://br.archive.ubuntu.com feisty-security/multiverse Sources
  404 Not Found [IP: 200.17.202.1 80]
Err http://br.archive.ubuntu.com feisty-security/universe Sources
  404 Not Found [IP: 200.17.202.1 80]
Err http://br.archive.ubuntu.com feisty-security/universe Packages
  404 Not Found [IP: 200.17.202.1 80]
Err http://br.archive.ubuntu.com feisty-security/multiverse Packages
  404 Not Found [IP: 200.17.202.1 80]
Falha ao baixar http://br.archive.ubuntu.com/ubuntu/dists/feisty/main/binary-amd64/Packages.gz  404 Not Found [IP: 200.17.202.1 80]
Falha ao baixar http://br.archive.ubuntu.com/ubuntu/dists/feisty/restricted/binary-amd64/Packages.gz  404 Not Found [IP: 200.17.202.1 80]
Falha ao baixar http://br.archive.ubuntu.com/ubuntu/dists/feisty/restricted/source/Sources.gz  404 Not Found [IP: 200.17.202.1 80]
Falha ao baixar http://br.archive.ubuntu.com/ubuntu/dists/feisty/main/source/Sources.gz  404 Not Found [IP: 200.17.202.1 80]
Falha ao baixar http://br.archive.ubuntu.com/ubuntu/dists/feisty/multiverse/source/Sources.gz  404 Not Found [IP: 200.17.202.1 80]
Falha ao baixar http://br.archive.ubuntu.com/ubuntu/dists/feisty/universe/source/Sources.gz  404 Not Found [IP: 200.17.202.1 80]
Falha ao baixar http://br.archive.ubuntu.com/ubuntu/dists/feisty/universe/binary-amd64/Packages.gz  404 Not Found [IP: 200.17.202.1 80]
Falha ao baixar http://br.archive.ubuntu.com/ubuntu/dists/feisty/multiverse/binary-amd64/Packages.gz  404 Not Found [IP: 200.17.202.1 80]
Falha ao baixar http://br.archive.ubuntu.com/ubuntu/dists/feisty-updates/main/binary-amd64/Packages.gz  404 Not Found [IP: 200.17.202.1 80]
Falha ao baixar http://br.archive.ubuntu.com/ubuntu/dists/feisty-updates/restricted/binary-amd64/Packages.gz  404 Not Found [IP: 200.17.202.1 80]
Falha ao baixar http://br.archive.ubuntu.com/ubuntu/dists/feisty-updates/main/source/Sources.gz  404 Not Found [IP: 200.17.202.1 80]
Falha ao baixar http://br.archive.ubuntu.com/ubuntu/dists/feisty-updates/restricted/source/Sources.gz  404 Not Found [IP: 200.17.202.1 80]
Falha ao baixar http://br.archive.ubuntu.com/ubuntu/dists/feisty-security/main/binary-amd64/Packages.gz  404 Not Found [IP: 200.17.202.1 80]
Falha ao baixar http://br.archive.ubuntu.com/ubuntu/dists/feisty-security/restricted/binary-amd64/Packages.gz  404 Not Found [IP: 200.17.202.1 80]
Falha ao baixar http://br.archive.ubuntu.com/ubuntu/dists/feisty-security/restricted/source/Sources.gz  404 Not Found [IP: 200.17.202.1 80]
Falha ao baixar http://br.archive.ubuntu.com/ubuntu/dists/feisty-security/main/source/Sources.gz  404 Not Found [IP: 200.17.202.1 80]
Falha ao baixar http://br.archive.ubuntu.com/ubuntu/dists/feisty-security/multiverse/source/Sources.gz  404 Not Found [IP: 200.17.202.1 80]
Falha ao baixar http://br.archive.ubuntu.com/ubuntu/dists/feisty-security/universe/source/Sources.gz  404 Not Found [IP: 200.17.202.1 80]
Falha ao baixar http://br.archive.ubuntu.com/ubuntu/dists/feisty-security/universe/binary-amd64/Packages.gz  404 Not Found [IP: 200.17.202.1 80]
Falha ao baixar http://br.archive.ubuntu.com/ubuntu/dists/feisty-security/multiverse/binary-amd64/Packages.gz  404 Not Found [IP: 200.17.202.1 80]
Lendo Lista de Pacotes... Pronto
E: Alguns arquivos de índice falharam no download, eles foram ignorados ou os antigos foram usados em seu lugar.

-----------------------------------------------------------------------------------------------------------------------------------------------------------

E quando tento atualizar pelo Synaptic me aparece o seguinte:

Não foi possível fazer o download de todos os índices de repositórios

O repositório pode não estar mais disponível ou pode não ter sido possível entrar em contato com o mesmo devido a problemas de rede. Caso esteja disponível, uma versão mais antiga do índice que falhou será usado. Em último caso, o repositório será ignorado. Cheque sua conexão de rede e certifique-se de que o endereço do repositório esteja correto nas preferências.

http://br.archive.ubuntu.com/ubuntu/dists/feisty/main/binary-amd64/Packages.gz: 404 Not Found [IP: 200.17.202.1 80]
http://br.archive.ubuntu.com/ubuntu/dists/feisty/restricted/binary-amd64/Packages.gz: 404 Not Found [IP: 200.17.202.1 80]
http://br.archive.ubuntu.com/ubuntu/dists/feisty/restricted/source/Sources.gz: 404 Not Found [IP: 200.17.202.1 80]
http://br.archive.ubuntu.com/ubuntu/dists/feisty/main/source/Sources.gz: 404 Not Found [IP: 200.17.202.1 80]
http://br.archive.ubuntu.com/ubuntu/dists/feisty/multiverse/source/Sources.gz: 404 Not Found [IP: 200.17.202.1 80]
http://br.archive.ubuntu.com/ubuntu/dists/feisty/universe/source/Sources.gz: 404 Not Found [IP: 200.17.202.1 80]
http://br.archive.ubuntu.com/ubuntu/dists/feisty/universe/binary-amd64/Packages.gz: 404 Not Found [IP: 200.17.202.1 80]
http://br.archive.ubuntu.com/ubuntu/dists/feisty/multiverse/binary-amd64/Packages.gz: 404 Not Found [IP: 200.17.202.1 80]
http://br.archive.ubuntu.com/ubuntu/dists/feisty-updates/main/binary-amd64/Packages.gz: 404 Not Found [IP: 200.17.202.1 80]
http://br.archive.ubuntu.com/ubuntu/dists/feisty-updates/restricted/binary-amd64/Packages.gz: 404 Not Found [IP: 200.17.202.1 80]
http://br.archive.ubuntu.com/ubuntu/dists/feisty-updates/main/source/Sources.gz: 404 Not Found [IP: 200.17.202.1 80]
http://br.archive.ubuntu.com/ubuntu/dists/feisty-updates/restricted/source/Sources.gz: 404 Not Found [IP: 200.17.202.1 80]
http://br.archive.ubuntu.com/ubuntu/dists/feisty-security/main/binary-amd64/Packages.gz: 404 Not Found [IP: 200.17.202.1 80]
http://br.archive.ubuntu.com/ubuntu/dists/feisty-security/restricted/binary-amd64/Packages.gz: 404 Not Found [IP: 200.17.202.1 80]
http://br.archive.ubuntu.com/ubuntu/dists/feisty-security/restricted/source/Sources.gz: 404 Not Found [IP: 200.17.202.1 80]
http://br.archive.ubuntu.com/ubuntu/dists/feisty-security/main/source/Sources.gz: 404 Not Found [IP: 200.17.202.1 80]
http://br.archive.ubuntu.com/ubuntu/dists/feisty-security/multiverse/source/Sources.gz: 404 Not Found [IP: 200.17.202.1 80]
http://br.archive.ubuntu.com/ubuntu/dists/feisty-security/universe/source/Sources.gz: 404 Not Found [IP: 200.17.202.1 80]
http://br.archive.ubuntu.com/ubuntu/dists/feisty-security/universe/binary-amd64/Packages.gz: 404 Not Found [IP: 200.17.202.1 80]
http://br.archive.ubuntu.com/ubuntu/dists/feisty-security/multiverse/binary-amd64/Packages.gz: 404 Not Found [IP: 200.17.202.1 80]

Muito obrigado pela ajuda.

Paulo.

[brunomacagnani]

Amigo o erro que ele esta dando é de pagina ou arquivo nao encontrado tente remover os sites e tente novamente