Failed to fetch com apt-get update

[cairo]

A alguns dias atras começou a aparecer estas linhas quando aplico o comando sudo apt-get update
O que e isto e como elimino este problema?


W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/raring-security/Release.gpg  Something wicked happened resolving 'security.ubuntu.com:http' (-11 - System error)

W: Failed to fetch http://archive.canonical.com/ubuntu/dists/raring/Release.gpg  Something wicked happened resolving 'archive.canonical.com:http' (-11 - System error)

W: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/raring/Release.gpg  Something wicked happened resolving 'extras.ubuntu.com:http' (-11 - System error)

W: Failed to fetch http://br.archive.ubuntu.com/ubuntu/dists/raring/Release.gpg  Something wicked happened resolving 'br.archive.ubuntu.com:http' (-11 - System error)

W: Failed to fetch http://packages.medibuntu.org/dists/raring/Release.gpg  Something wicked happened resolving 'packages.medibuntu.org:http' (-11 - System error)

W: Failed to fetch http://repo.steampowered.com/steam/dists/precise/Release.gpg  Something wicked happened resolving 'repo.steampowered.com:http' (-11 - System error)

[koheleth]

Vá no terminal e digite:

Código Selecionar Expandir

$ sudo gedit /etc/apt/sources.list

Comente(colocando #) as linhas que estão dando erro, e pronto!