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warning: Setting locale failed
Posted March 16, 2009

Sometimes you get warnings like this cluttering your terminal.

perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
	LANGUAGE = (unset),
	LC_ALL = (unset),
	LANG = "en_CA.UTF-8"
    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

If your system is relatively modern, the trouble is just that your client (workstation) wants to be in a locale (en_CA here) that your server is not prepared for. To prepare the server:

sudo locale-gen en_CA.UTF-8 en_CA

You should see something like this:

Generating locales...
  en_CA.ISO-8859-1... done
  en_CA.UTF-8... done
Generation complete.

If you recently upgraded from a pre-gutsy system, try:

sudo update-locale LC_ALL=POSIX LANG=en_CA.UTF-8

This updates /etc/default/locale.

Next login, you should be able to run perl -e '' without clutter.