Estou usando o coala cármico do Ubuntu. Quando fiz login pela primeira vez, o arquivo sources.list tinha uma lista desatualizada de repositórios e, portanto, os pacotes não puderam ser acessados. Então atualizei o sources.list para
deb http://old-releases.ubuntu.com/ubuntu/ karmic main restricted
deb-src http://old-releases.ubuntu.com/ubuntu/ karmic main restricted
deb http://old-releases.ubuntu.com/ubuntu/ karmic-updates main restricted
deb-src http://old-releases.ubuntu.com/ubuntu/ karmic-updates main restricted
deb http://old-releases.ubuntu.com/ubuntu/ karmic universe
deb-src http://old-releases.ubuntu.com/ubuntu/ karmic universe
deb http://old-releases.ubuntu.com/ubuntu/ karmic-updates universe
deb-src http://old-releases.ubuntu.com/ubuntu/ karmic-updates universe
deb http://old-releases.ubuntu.com/ubuntu/ karmic multiverse
deb-src http://old-releases.ubuntu.com/ubuntu/ karmic multiverse
deb http://old-releases.ubuntu.com/ubuntu/ karmic-updates multiverse
deb-src http://old-releases.ubuntu.com/ubuntu/ karmic-updates multiverse
deb http://security.ubuntu.com/ubuntu karmic-security main restricted
deb-src http://security.ubuntu.com/ubuntu karmic-security main restricted
deb http://security.ubuntu.com/ubuntu karmic-security universe
deb-src http://security.ubuntu.com/ubuntu karmic-security universe
deb http://security.ubuntu.com/ubuntu karmic-security multiverse
deb-src http://security.ubuntu.com/ubuntu karmic-security multiverse
Depois disso eu poderia realizar a atualização e obter os pacotes usando o gerenciador sináptico. Mas agora, de repente, tanto o gerenciador sináptico quanto as ferramentas de linha de comando geram o erro
Could not resolve 'security.ubuntu.com'
Could not resolve 'old-releases.ubuntu.com'
Isso poderia ser um problema temporário com o servidor? (Mas o ping para o servidor retorna respostas). Por favor, venha me dizer qual é o problema ...