andrew@ubuntu:~$ sudo dpkg-reconfigure -plow locales
[sudo] password for andrew:
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
	LANGUAGE = "en_US.UTF-8",
	LC_ALL = (unset),
	LANG = "en_US.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
andrew@ubuntu:~$ man awk
man: can't set the locale; make sure $LC_* and $LANG are correct