Tengo problemas con aptitude update

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Felipe
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Beigetreten: 11/28/2010

Cuando pongo aptitude update en shell me aparece el sigueinte error:

W: GPG error: http://ftp.rediris.es brigantia Release: The following signatures were invalid: BADSIG B4EFB9F38D8AEBF1 Trisquel GNU/Linux (Trisquel GNU/Linux signing key) <name at domain>
W: GPG error: http://ftp.rediris.es brigantia-security Release: The following signatures were invalid: BADSIG B4EFB9F38D8AEBF1 Trisquel GNU/Linux (Trisquel GNU/Linux signing key) <name at domain>
W: GPG error: http://ftp.rediris.es brigantia-updates Release: The following signatures were invalid: BADSIG B4EFB9F38D8AEBF1 Trisquel GNU/Linux (Trisquel GNU/Linux signing key) <name at domain>