Durante a instalação do DansGuardian, conforme as instruções no seguinte link: Filtragem de Conteúdo Dansguardian com Proxy Transparente No Ubuntu 9.10 Karmic , eu configurei o iptables usando sudo iptables -t nat -A OUTPUT -p tcp -m owner ! --uid-owner proxy --dport 80 -j REDIRECT --to-port 8080 para que as requisições web de saída que são feitas por qualquer pessoa que não seja o proxy devam ser redirecionadas para o proxy. Salvei isso em /etc/init.d/tproxy , para tornar essas alterações permanentes.
Depois de fazer isso, eu deletei DansGuardian, squid e iptables para refazer todo o procedimento, usando sudo apt autoremove dansguardian squid iptables
Toda vez que eu executo sudo apt-get update ou sudo apt-get install .. agora, recebo o seguinte erro.
dell@dell-Inspiron-5558:/etc$ sudo apt-get update
Err:1 http://ppa.launchpad.net/webupd8team/sublime-text-3/ubuntu zesty InRelease
Could not connect to ppa.launchpad.net:80 (91.189.95.83). - connect (111: Connection refused)
Err:2 http://archive.canonical.com/ubuntu zesty InRelease
Could not connect to archive.canonical.com:80 (91.189.91.15). - connect (111: Connection refused) [IP: 91.189.91.15 80]
Err:3 http://in.old-releases.ubuntu.com/ubuntu zesty InRelease
Could not resolve 'in.old-releases.ubuntu.com'
Err:4 http://archive.ubuntu.com/ubuntu zesty InRelease
Could not connect to archive.ubuntu.com:80 (91.189.88.162). - connect (111: Connection refused) [IP: 91.189.88.162 80]
Err:5 http://in.old-releases.ubuntu.com/ubuntu zesty-updates InRelease
Could not resolve 'in.old-releases.ubuntu.com'
Err:6 http://in.old-releases.ubuntu.com/ubuntu zesty-backports InRelease
Could not resolve 'in.old-releases.ubuntu.com'
Err:7 http://in.old-releases.ubuntu.com/ubuntu zesty-security InRelease
Could not resolve 'in.old-releases.ubuntu.com'
Reading package lists... Done
W: Failed to fetch http://in.old-releases.ubuntu.com/ubuntu/dists/zesty/InRelease Could not resolve 'in.old-releases.ubuntu.com'
W: Failed to fetch http://in.old-releases.ubuntu.com/ubuntu/dists/zesty-updates/InRelease Could not resolve 'in.old-releases.ubuntu.com'
W: Failed to fetch http://in.old-releases.ubuntu.com/ubuntu/dists/zesty-backports/InRelease Could not resolve 'in.old-releases.ubuntu.com'
W: Failed to fetch http://archive.canonical.com/ubuntu/dists/zesty/InRelease Could not connect to archive.canonical.com:80 (91.189.91.15). - connect (111: Connection refused) [IP: 91.189.91.15 80]
W: Failed to fetch http://in.old-releases.ubuntu.com/ubuntu/dists/zesty-security/InRelease Could not resolve 'in.old-releases.ubuntu.com'
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/zesty/InRelease Could not connect to archive.ubuntu.com:80 (91.189.88.162). - connect (111: Connection refused) [IP: 91.189.88.162 80]
W: Failed to fetch http://ppa.launchpad.net/webupd8team/sublime-text-3/ubuntu/dists/zesty/InRelease Could not connect to ppa.launchpad.net:80 (91.189.95.83). - connect (111: Connection refused)
W: Some index files failed to download. They have been ignored, or old ones used instead.
Os recursos mencionados, ou repositórios como arquivos do ubuntu, também estão inacessíveis através do navegador. Eu suspeito que isso se deva às configurações de ip que foram salvas antes de excluir os três arquivos mencionados.
Existe uma maneira de desfazer a mudança iptables -t nat -A OUTPUT -p tcp -m owner ! --uid-owner proxy --dport 80 -j REDIRECT --to-port 8080 apesar do fato de eu não ter mais iptables?
Todas as sugestões para fazer o mesmo ou qualquer diagnóstico alternativo são bem-vindas.