Varios errores surgen en SID

[cocozz <cocozz@gmail.com>]

Buenas, 

Recien he cambiado a SID y tengo tres errores que me salen con frecuencia.

1. Al ejecutar varios programas (en este caso con xvidcap):

cocozz@Cocozz:~$ xvidcap 
xvidcap: symbol lookup error: /usr/lib/libavcodec.so.0.4.8: undefined symbol: faacDecOpen

2. Al instalar cualquier programa con apt-get

perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
        LANGUAGE = "es_ES:es:en_GB:en",
        LC_ALL = (unset),
        LANG = "es_ES:es:en_GB:en"
    are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
locale: Cannot set LC_CTYPE to default locale: No such file or directory
locale: Cannot set LC_MESSAGES to default locale: No such file or directory
locale: Cannot set LC_ALL to default locale: No such file or directory

3. Trás realizar un apt-get update

W: GPG error: ftp://ftp.nerim.net sid Release: The following signatures couldn't 
 be verified because the public key is not available: NO_PUBKEY 07DC563D1F41B907
W: GPG error: http://www.stanchina.net ./ Release: The following signatures coul 
dn't be verified because the public key is not available: NO_PUBKEY 3DCCCCACE46F 
104F


Eso es todo, espero que me expliquen como solucionarlo, muchas gracias.