Perl warning in apt-get operations...

[Rogelio E. Castillo Haro]

Hi!
When i use apt-get...I've the next 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 standar locale ("C").

This happens later I use red carpet to upgrade a lot of packages... :(
Where can I set this parameters?

TIA