Howto fix this warning of locales

[maikhai]

Hi All!

Running apt-get install k3b I see:

perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
        LANGUAGE = "en_US:en_GB:en",
        LC_ALL = (unset),
        LANG = "en_US.UTF-8"
    are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").

Pls show me howto fix this? (I always use LANG=en_US.UTF-8 in my system)

Thank in advance!
m k h _ s g n