source.list problemas

[ebs007]

como posso corrigir esses erros?

Obtendo:1 http://br.archive.ubuntu.com dapper-updates Release.gpg [189B]
Atingido http://br.archive.ubuntu.com dapper-updates Release
Atingido http://br.archive.ubuntu.com dapper-updates/multiverse Packages
Atingido http://br.archive.ubuntu.com dapper-updates/universe Packages
Obtendo:2 http://security.ubuntu.com dapper-security Release.gpg [189B]
Obtendo:3 http://archive.ubuntu.com dapper Release.gpg [189B]
Obtendo:4 http://archive.ubuntu.com dapper-updates Release.gpg [189B]
Obtendo:5 http://archive.canonical.com dapper-commercial Release.gpg [191B]
Atingido http://security.ubuntu.com dapper-security Release
Obtendo:6 http://archive.ubuntu.com dapper-backports Release.gpg [189B]
Atingido http://archive.ubuntu.com dapper Release
Atingido http://archive.canonical.com dapper-commercial Release
Atingido http://security.ubuntu.com dapper-security/main Packages
Atingido http://archive.ubuntu.com dapper-updates Release
Atingido http://archive.canonical.com dapper-commercial/main Packages
Atingido http://security.ubuntu.com dapper-security/restricted Packages
Atingido http://security.ubuntu.com dapper-security/main Sources
Atingido http://archive.ubuntu.com dapper-backports Release
Atingido http://archive.ubuntu.com dapper/main Packages
Atingido http://security.ubuntu.com dapper-security/restricted Sources
Atingido http://security.ubuntu.com dapper-security/universe Packages
Atingido http://security.ubuntu.com dapper-security/universe Sources
Atingido http://archive.ubuntu.com dapper/restricted Packages
Atingido http://archive.ubuntu.com dapper/main Sources
Atingido http://archive.ubuntu.com dapper/restricted Sources
Atingido http://archive.ubuntu.com dapper/universe Packages
Atingido http://archive.ubuntu.com dapper/universe Sources
Atingido http://archive.ubuntu.com dapper/multiverse Packages
Ign http://archive.ubuntu.com dapper/multiverse Sources
Atingido http://archive.ubuntu.com dapper-updates/main Packages
Obtendo:7 http://archive.ubuntu.com dapper-updates/restricted Packages [14B]
Atingido http://archive.ubuntu.com dapper-updates/main Sources
Obtendo:8 http://archive.ubuntu.com dapper-updates/restricted Sources [14B]
Obtendo:9 http://archive.ubuntu.com dapper-backports/main Packages [14B]
Obtendo:10 http://archive.ubuntu.com dapper-backports/restricted Packages [14B]
Obtendo:11 http://archive.ubuntu.com dapper-backports/universe Packages [14B]
Obtendo:12 http://archive.ubuntu.com dapper-backports/multiverse Packages [14B]
Obtendo:13 http://archive.ubuntu.com dapper-backports/main Sources [14B]
Obtendo:14 http://archive.ubuntu.com dapper-backports/restricted Sources [14B]
Obtendo:15 http://archive.ubuntu.com dapper-backports/universe Sources [14B]
Obtendo:16 http://archive.ubuntu.com dapper-backports/multiverse Sources [14B]
Obtendo:17 http://archive.ubuntu.com dapper/multiverse Sources [57,5kB]
99% [17 Sources gzip 0]
gzip: stdin: not in gzip format
Err http://archive.ubuntu.com dapper/multiverse Sources
  Sub-processo gzip retornou um código de erro (1)
Baixados 147B em 2s (52B/s)
Falha ao baixar http://archive.ubuntu.com/ubuntu/dists/dapper/multiverse/source/Sources.gz  Sub-processo gzip retornou um código de erro (1)
Lendo Lista de Pacotes... Pronto
E: Alguns arquivos de índice falharam no download, eles foram ignorados ou os antigos foram usados em seu lugar.

[Lamego]

Isso acontece porque você está utilizando os repositorios centrais que tem tido problemas.
Abre um terminal e edita o arquivo /etc/apt/sources.list com o comando:

Código Selecionar Expandir

gksudo gedit  /etc/apt/sources.list

Subtitui os http://archive.ubuntu.com por http://br.archive.ubuntu.com