just import the keys: gpg --recv 6070D3A1 && gpg --export --armor 6070D3A1 | apt-key add - This is the key's owner: gpg: key 6070D3A1: public key "Debian Archive Automatic Signing Key (4.0/etch) <ftpmaster@debian.org>" imported [GNUPG:] IMPORTED A70DAF536070D3A1 Debian Archive Automatic Signing Key (4.0/etch) <ftpmaster@debian.org>
it returns: gpg: no keyserver known (use option --keyserver) gpg: keyserver receive failed: bad URI but it worked with: # gpg --keyserver hkp://subkeys.pgp.net --recv 6070D3A1 && gpg --export --armor 6070D3A1 | apt-key add - gpg: requesting key 6070D3A1 from hkp server subkeys.pgp.net gpg: key 6070D3A1: public key "Debian Archive Automatic Signing Key (4.0/etch) <ftpmaster@debian.org>" imported gpg: no ultimately trusted keys found gpg: Total number processed: 1 gpg: imported: 1 OK Giulio