erro ao tentar atualizar ,atraves do gerenciador.....

[f4rrel]

O repositório pode não estar mais disponível ou pode não ter sido possível contactá-lo devido a problemas de rede. Se disponível, uma versão mais antiga do índice que falhou será usada. Senão, o repositório será ignorado. Verifique a sua conexão de rede e assegure-se de que o endereço do repositório nas preferências está correto.

Falhou ao buscar http://archive.canonical.com/ubuntu/dists/hardy/Release  Unable to find expected entry  (Código/binary-i386/Packages in Meta-index file (malformed Release file?)
Falhou ao buscar http://br.archive.ubuntu.com/ubuntu/dists/feisty/main/binary-i386/Packages  404 Not Found [IP: 200.236.31.1 80]
Falhou ao buscar http://br.archive.ubuntu.com/ubuntu/dists/feisty/restricted/binary-i386/Packages  404 Not Found [IP: 200.236.31.1 80]
Falhou ao buscar http://br.archive.ubuntu.com/ubuntu/dists/feisty/main/source/Sources  404 Not Found [IP: 200.236.31.1 80]
Falhou ao buscar http://br.archive.ubuntu.com/ubuntu/dists/feisty/restricted/source/Sources  404 Not Found [IP: 200.236.31.1 80]
Falhou ao buscar http://br.archive.ubuntu.com/ubuntu/dists/feisty/universe/binary-i386/Packages  404 Not Found [IP: 200.236.31.1 80]
Falhou ao buscar http://br.archive.ubuntu.com/ubuntu/dists/feisty/universe/source/Sources  404 Not Found [IP: 200.236.31.1 80]
Falhou ao buscar http://br.archive.ubuntu.com/ubuntu/dists/feisty/multiverse/binary-i386/Packages  404 Not Found [IP: 200.236.31.1 80]
Falhou ao buscar http://br.archive.ubuntu.com/ubuntu/dists/feisty/multiverse/source/Sources  404 Not Found [IP: 200.236.31.1 80]
Falhou ao buscar http://br.archive.ubuntu.com/ubuntu/dists/feisty-updates/main/source/Sources  404 Not Found [IP: 200.236.31.1 80]
Falhou ao buscar http://br.archive.ubuntu.com/ubuntu/dists/feisty-updates/restricted/source/Sources  404 Not Found [IP: 200.236.31.1 80]
Falhou ao buscar http://br.archive.ubuntu.com/ubuntu/dists/feisty-backports/main/binary-i386/Packages  404 Not Found [IP: 200.236.31.1 80]
Falhou ao buscar http://br.archive.ubuntu.com/ubuntu/dists/feisty-backports/restricted/binary-i386/Packages  404 Not Found [IP: 200.236.31.1 80]
Falhou ao buscar http://br.archive.ubuntu.com/ubuntu/dists/feisty-backports/universe/binary-i386/Packages  404 Not Found [IP: 200.236.31.1 80]
Falhou ao buscar http://br.archive.ubuntu.com/ubuntu/dists/feisty-backports/multiverse/binary-i386/Packages  404 Not Found [IP: 200.236.31.1 80]
Falhou ao buscar http://br.archive.ubuntu.com/ubuntu/dists/feisty-backports/main/source/Sources  404 Not Found [IP: 200.236.31.1 80]
Falhou ao buscar http://br.archive.ubuntu.com/ubuntu/dists/feisty-backports/restricted/source/Sources  404 Not Found [IP: 200.236.31.1 80]
Falhou ao buscar http://br.archive.ubuntu.com/ubuntu/dists/feisty-backports/universe/source/Sources  404 Not Found [IP: 200.236.31.1 80]
Falhou ao buscar http://br.archive.ubuntu.com/ubuntu/dists/feisty-backports/multiverse/source/Sources  404 Not Found [IP: 200.236.31.1 80]
Falhou ao buscar http://security.ubuntu.com/ubuntu/dists/feisty-security/main/binary-i386/Packages  404 Not Found
Falhou ao buscar http://security.ubuntu.com/ubuntu/dists/feisty-security/restricted/binary-i386/Packages  404 Not Found
Falhou ao buscar http://security.ubuntu.com/ubuntu/dists/feisty-security/main/source/Sources  404 Not Found
Falhou ao buscar http://security.ubuntu.com/ubuntu/dists/feisty-security/restricted/source/Sources  404 Not Found
Falhou ao buscar http://security.ubuntu.com/ubuntu/dists/feisty-security/universe/binary-i386/Packages  404 Not Found
Falhou ao buscar http://security.ubuntu.com/ubuntu/dists/feisty-security/universe/source/Sources  404 Not Found
Falhou ao buscar http://security.ubuntu.com/ubuntu/dists/feisty-security/multiverse/binary-i386/Packages  404 Not Found
Falhou ao buscar http://security.ubuntu.com/ubuntu/dists/feisty-security/multiverse/source/Sources  404 Not Found
Alguns arquivos de índice falharam para baixar, eles foram ignorados ou os antigos foram usados no lugar.

[elvenrix]

A pesquisa poderia ajudar....
Mas de qualquer forma isto pode resolver