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When performing apt-get update, I get the following error:

root@ADS3-Debian6:/home/aluno# apt-get update
Atingido http://sft.if.usp.br squeeze Release.gpg
Ign http://sft.if.usp.br/debian/ squeeze/contrib Translation-en
Ign http://sft.if.usp.br/debian/ squeeze/contrib Translation-pt
Ign http://sft.if.usp.br/debian/ squeeze/contrib Translation-pt_BR

(...)

Obter:10 http://security.debian.org squeeze/updates/non-free i386 Packages [14 B]
Baixados 612 kB em 4s (125 kB/s)                    
Lendo listas de pacotes... Pronto
There is no public key available for the following key IDs: 8B48AD6246925553
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... and that string you elided is an important bit. It'd let us identify which keys you're missing (assuming installing the keyring packages—preferably from trusted media—that ruda suggested doesn't help) –  derobert May 14 '13 at 17:43
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1 Answer

up vote 14 down vote accepted

According to There is no public key available for the following key ID, this will fix it:

sudo aptitude install debian-keyring debian-archive-keyring
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The last 8 hex digits are shared with this, so it's probably complaining about wheezy. Unfortunate of the OP to have elided that: pub 4096R/46925553 2012-04-27 [expires: 2020-04-25] uid Debian Archive Automatic Signing Key (7.0/wheezy) <ftpmaster@debian.org> –  user18096 Jun 2 '13 at 0:56
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