(linux-br)Erro no apt-get update

[Rodrigo Faria Tavares]

Instalei o CL 9, coloquei a maquina na internet mas na hora de rodar o 
apt-get update vem esse erro

[EMAIL PROTECTED] root]# apt-get update
Get:1 ftp://ftp.unicamp.br 9/i386 release [1864B]
Err ftp://ftp.unicamp.br 9/i386 release
 file was not signed with a known key. Check if the proper gpg key was 
imported to your keyring.
Get:2 ftp://ftp.unicamp.br 9/i386 release [685B]
Err ftp://ftp.unicamp.br 9/i386 release
 file was not signed with a known key. Check if the proper gpg key was 
imported to your keyring.
Obtidos 2549B em 1s (1514B/s)

como posso resolver isso ?
Att,
Rodrigo Faria 

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