Setting locale failed

[Marcelo Chiapparini <chiappa@uerj.br>]

Dear Debianers,

When I apt-get install some packages I get the following message:


perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
        LANGUAGE = (unset),
        LC_ALL = (unset),
        LANG = "en.ISO8859-1"
    are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").


what does it mean? How can I fix it? I didn't find any man page regarding 
locale... 

Thanks in advance!

Marcelo  

-- 
Marcelo Chiapparini
DFT-IF/UERJ
chiappa@uerj.br