Eu sou novo no Ubuntu e quando executo
sudo apt-get update
Eu recebo os seguintes erros e avisos
W: GPG error: http://ppa.launchpad.net quantal Release: The following
signatures couldn't be verified because the public key is not
available: NO_PUBKEY 5A9A06AEF9CB8DB0 W: Failed to fetch
http://security.ubuntu.com/ubuntu/dists/quantal-security/Release.gpg
Something wicked happened resolving 'security.ubuntu.com:http' (-5 -
No address associated with hostname)
W: Failed to fetch
http://extras.ubuntu.com/ubuntu/dists/quantal/Release.gpg Something
wicked happened resolving 'extras.ubuntu.com:http' (-5 - No address
associated with hostname)
W: Failed to fetch
http://packages.medibuntu.org/dists/quantal/Release.gpg Something
wicked happened resolving 'packages.medibuntu.org:http' (-5 - No
address associated with hostname)
E: Some index files failed to download. They have been ignored, or old
ones used instead.
Alguém pode me dizer o que está errado?
Para o erro com assinatura:
sudo gpg --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 5A9A06AEF9CB8DB0
sudo gpg --armor --export 5A9A06AEF9CB8DB0 | sudo apt-key add -
Então, sudo apt-get update sudo apt-get upgrade
O motivo pelo qual você precisa fazer isso é que você adicionou um PPA à sua sources.list sem confiar na chave usada para assinar os pacotes.