Erreur Apt-get

[Maclin <spam-maclin@free.fr>]

Bonjour à tous
lors de l'utilisation de apt-get install, ce message apparait,
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
        LANGUAGE = "fr_FR:fr:en_GB:en",
        LC_ALL = (unset),
        LANG = "fr_FR"
    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

Pourquoi ?