This is what I get:

[codesyntax lang="bash"]

perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
LANGUAGE = (unset),
LC_ALL = (unset),
LANG = "en_US.utf8"
are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").

[/codesyntax]

 This is how I fix it:

[codesyntax lang="bash"]

export LANGUAGE=en_US.UTF-8
export LANG=en_US.UTF-8
export LC_ALL=en_US.UTF-8
locale-gen en_US.UTF-8
apt-get install locales
dpkg-reconfigure locales

[/codesyntax]

The export lines above can also be saved into either ~/.profile or ~/.bashrc.