Parece ser um problema com o seu resolvedor de DNS.
Could not resolve 'security.debian.org'
Could not resolve 'ftp.us.debian.org'
etc, etc
Como root eu digito este comando apt-get update e recebo essas mensagens de erro.
> Err http://security.debian.org lenny/updates Release.gpg
Could not resolve 'security.debian.org'
Err http://security.debian.org lenny/updates/main Translation-en_US
Could not resolve 'security.debian.org'
Err http://security.debian.org lenny/updates/contrib Translation-en_US
Could not resolve 'security.debian.org'
Err http://security.debian.org lenny/updates/non-free Translation-en_US
Could not resolve 'security.debian.org'
Err http://www.backports.org lenny-backports Release.gpg
Could not resolve 'www.backports.org'
Err http://www.backports.org lenny-backports/main Translation-en_US
Could not resolve 'www.backports.org'
Err http://www.backports.org lenny-backports/contrib Translation-en_US
Could not resolve 'www.backports.org'
Err http://www.backports.org lenny-backports/non-free Translation-en_US
Could not resolve 'www.backports.org'
Err http://ftp.us.debian.org lenny Release.gpg
Could not resolve 'ftp.us.debian.org'
Err http://ftp.us.debian.org lenny/main Translation-en_US
Could not resolve 'ftp.us.debian.org'
Err http://ftp.us.debian.org lenny/contrib Translation-en_US
Could not resolve 'ftp.us.debian.org'
Err http://ftp.us.debian.org lenny/non-free Translation-en_US
Could not resolve 'ftp.us.debian.org'
Err http://http.us.debian.org stable Release.gpg
Could not resolve 'http.us.debian.org'
Err http://http.us.debian.org stable/main Translation-en_US
Could not resolve 'http.us.debian.org'
Err http://http.us.debian.org stable/contrib Translation-en_US
Could not resolve 'http.us.debian.org'
Err http://http.us.debian.org stable/non-free Translation-en_US
Could not resolve 'http.us.debian.org'
Reading package lists... Done
W: Failed to fetch http://ftp.us.debian.org/debian/dists/lenny/Release.gpg Could not resolve 'ftp.us.debian.org'
W: Failed to fetch http://ftp.us.debian.org/debian/dists/lenny/main/i18n/Translation-en_US.gz Could not resolve 'ftp.us.debian.org'
W: Failed to fetch http://ftp.us.debian.org/debian/dists/lenny/contrib/i18n/Translation-en_US.gz Could not resolve 'ftp.us.debian.org'
W: Failed to fetch http://ftp.us.debian.org/debian/dists/lenny/non-free/i18n/Translation-en_US.gz Could not resolve 'ftp.us.debian.org'
W: Failed to fetch http://http.us.debian.org/debian/dists/stable/Release.gpg Could not resolve 'http.us.debian.org'
W: Failed to fetch http://http.us.debian.org/debian/dists/stable/main/i18n/Translation-en_US.gz Could not resolve 'http.us.debian.org'
W: Failed to fetch http://http.us.debian.org/debian/dists/stable/contrib/i18n/Translation-en_US.gz Could not resolve 'http.us.debian.org'
W: Failed to fetch http://http.us.debian.org/debian/dists/stable/non-free/i18n/Translation-en_US.gz Could not resolve 'http.us.debian.org'
W: Failed to fetch http://security.debian.org/dists/lenny/updates/Release.gpg Could not resolve 'security.debian.org'
W: Failed to fetch http://security.debian.org/dists/lenny/updates/main/i18n/Translation-en_US.gz Could not resolve 'security.debian.org'
W: Failed to fetch http://security.debian.org/dists/lenny/updates/contrib/i18n/Translation-en_US.gz Could not resolve 'security.debian.org'
W: Failed to fetch http://security.debian.org/dists/lenny/updates/non-free/i18n/Translation-en_US.gz Could not resolve 'security.debian.org'
W: Failed to fetch http://www.backports.org/debian/dists/lenny-backports/Release.gpg Could not resolve 'www.backports.org'
W: Failed to fetch http://www.backports.org/debian/dists/lenny-backports/main/i18n/Translation-en_US.gz Could not resolve 'www.backports.org'
W: Failed to fetch http://www.backports.org/debian/dists/lenny-backports/contrib/i18n/Translation-en_US.gz Could not resolve 'www.backports.org'
W: Failed to fetch http://www.backports.org/debian/dists/lenny-backports/non-free/i18n/Translation-en_US.gz Could not resolve 'www.backports.org'
W: Some index files failed to download, they have been ignored, or old ones used instead.
W: You may want to run apt-get update to correct these problems
Isso está em um servidor linux dreamplug. Configurado para que minha rede inicie em 192.168.1.2 e meu roteador seja o encaminhamento de porta ssh para 192.168.1.6 no servidor.
Parece ser um problema com o seu resolvedor de DNS.
Could not resolve 'security.debian.org'
Could not resolve 'ftp.us.debian.org'
etc, etc
Pode ser útil adicionar mais detalhes.
Qual solução de problemas você tentou?
A atualização do apt-get funcionou antes e recentemente parou de funcionar?
Você pode fazer ping de algum dos sites listados no erro?
Eu tive que pesquisar muito sobre isso aqui.
O HTTP parece ter um problema para resolver, mas não para FTP. Eu tentei colocar em FTP://
em vez de HTTP://
e deu certo.
Editar:
/etc/apt/sources.list
deb-src ftp://ftp.uk.debian.org/debian/ wheezy main
deb ftp://ftp.uk.debian.org/debian/ wheezy main