Depois de ler o seu post, eu notei praticamente a mesma coisa. Pode ser que o servidor deles esteja em baixo um pouco.
como há 3 horas quando eu digito sudo apt-get update meus repositórios atualizam muito bem, mas agora recebo estas mensagens:
Err http://ppa.launchpad.net natty InRelease
Err http://ppa.launchpad.net natty InRelease
Err http://ppa.launchpad.net natty InRelease
Err http://ppa.launchpad.net natty InRelease
Err http://ppa.launchpad.net natty InRelease
Err http://ppa.launchpad.net natty InRelease
Err http://ppa.launchpad.net natty InRelease
Err http://ppa.launchpad.net natty InRelease
Err http://ppa.launchpad.net natty InRelease
Err http://ppa.launchpad.net natty InRelease
Err http://ppa.launchpad.net natty InRelease
Err http://ppa.launchpad.net natty InRelease
Err http://ppa.launchpad.net natty Release.gpg
Unable to connect to ppa.launchpad.net:http:
Err http://ppa.launchpad.net natty Release.gpg
Unable to connect to ppa.launchpad.net:http:
Err http://ppa.launchpad.net natty Release.gpg
Unable to connect to ppa.launchpad.net:http:
Err http://ppa.launchpad.net natty Release.gpg
Unable to connect to ppa.launchpad.net:http:
Err http://ppa.launchpad.net natty Release.gpg
Unable to connect to ppa.launchpad.net:http:
Err http://ppa.launchpad.net natty Release.gpg
Unable to connect to ppa.launchpad.net:http:
Err http://ppa.launchpad.net natty Release.gpg
Unable to connect to ppa.launchpad.net:http:
Err http://ppa.launchpad.net natty Release.gpg
Unable to connect to ppa.launchpad.net:http:
Err http://ppa.launchpad.net natty Release.gpg
Unable to connect to ppa.launchpad.net:http:
Err http://ppa.launchpad.net natty Release.gpg
Unable to connect to ppa.launchpad.net:http:
Err http://ppa.launchpad.net natty Release.gpg
Unable to connect to ppa.launchpad.net:http:
Err http://ppa.launchpad.net natty Release.gpg
Unable to connect to ppa.launchpad.net:http:
Reading package lists... Done
W: Failed to fetch http://ppa.launchpad.net/adilson/experimental/ubuntu/dists/natty /InRelease
W: Failed to fetch http://ppa.launchpad.net/alexeftimie/ppa/ubuntu/dists/natty/InRelease
W: Failed to fetch http://ppa.launchpad.net/am-monkeyd/nautilus-elementary-ppa/ubuntu/dists/natty/InRelease
W: Failed to fetch http://ppa.launchpad.net/chromium-daily/dev/ubuntu/dists/natty/InRelease
W: Failed to fetch http://ppa.launchpad.net/elementaryart/elementarydesktop/ubuntu/dists/natty/InRelease
W: Failed to fetch http://ppa.launchpad.net/ferramroberto/java/ubuntu/dists/natty/InRelease
W: Failed to fetch http://ppa.launchpad.net/gnome3-team/gnome3/ubuntu/dists/natty/InRelease
W: Failed to fetch http://ppa.launchpad.net/nilarimogard/webupd8/ubuntu/dists/natty/InRelease
W: Failed to fetch http://ppa.launchpad.net/pidgin-developers/ppa/ubuntu/dists/natty/InRelease
W: Failed to fetch http://ppa.launchpad.net/tiheum/equinox/ubuntu/dists/natty/InRelease
W: Failed to fetch http://ppa.launchpad.net/tualatrix/ppa/ubuntu/dists/natty/InRelease
W: Failed to fetch http://ppa.launchpad.net/zeitgeist/ppa/ubuntu/dists/natty/InRelease
W: Failed to fetch http://ppa.launchpad.net/adilson/experimental/ubuntu/dists/natty/Release.gpg Unable to connect to ppa.launchpad.net:http:
W: Failed to fetch http://ppa.launchpad.net/alexeftimie/ppa/ubuntu/dists/natty/Release.gpg Unable to connect to ppa.launchpad.net:http:
W: Failed to fetch http://ppa.launchpad.net/am-monkeyd/nautilus-elementary-ppa/ubuntu/dists/natty/Release.gpg Unable to connect to ppa.launchpad.net:http:
W: Failed to fetch http://ppa.launchpad.net/chromium-daily/dev/ubuntu/dists/natty/Release.gpg Unable to connect to ppa.launchpad.net:http:
W: Failed to fetch http://ppa.launchpad.net/elementaryart/elementarydesktop/ubuntu/dists/natty/Release.gpg Unable to connect to ppa.launchpad.net:http:
W: Failed to fetch http://ppa.launchpad.net/ferramroberto/java/ubuntu/dists/natty/Release.gpg Unable to connect to ppa.launchpad.net:http:
W: Failed to fetch http://ppa.launchpad.net/gnome3-team/gnome3/ubuntu/dists/natty /Release.gpg Unable to connect to ppa.launchpad.net:http:
W: Failed to fetch http://ppa.launchpad.net/nilarimogard/webupd8/ubuntu/dists/natty/Release.gpg Unable to connect to ppa.launchpad.net:http:
W: Failed to fetch http://ppa.launchpad.net/pidgin-developers/ppa/ubuntu/dists/natty/Release.gpg Unable to connect to ppa.launchpad.net:http:
W: Failed to fetch http://ppa.launchpad.net/tiheum/equinox/ubuntu/dists/natty/Release.gpg Unable to connect to ppa.launchpad.net:http:
W: Failed to fetch http://ppa.launchpad.net/tualatrix/ppa/ubuntu/dists/natty/Release.gpg Unable to connect to ppa.launchpad.net:http:
W: Failed to fetch http://ppa.launchpad.net/zeitgeist/ppa/ubuntu/dists/natty/Release.gpg Unable to connect to ppa.launchpad.net:http:
W: Some index files failed to download. They have been ignored, or old ones used instead.
Depois de ler o seu post, eu notei praticamente a mesma coisa. Pode ser que o servidor deles esteja em baixo um pouco.
Eu tive o mesmo problema e resolvi esse problema configurando o endereço DNS do meu provedor manualmente /etc/resolv.conf (Esse é provavelmente outro problema porque eu tinha dns como 192.168.0.254 do dhcp) Rafael, você pode ter o mesmo problema?