locale errors during apt-get upgrades in ubuntu

Question

Ive been using Ubuntu since 11.10. Why do I get the following messages whenever I update my packages? Why doesnot Ubuntu itself set them by default?

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
perl: warning: Setting locale failed
perl: warning: Please check that your locale settings:
            LANGUAGE = (unset),
            LC_ALL = (unset)
            LANG = "en_IN.ISO8859-1"
       are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").

Answer 1

Ubuntu uses UTF-8 locales by default, and for some reason you've specified the obsolete ISO 8859-1 here. Try setting lang to en_IN.UTF-8 instead, wherever you've done so (~/.bashrc? ~/.profile?).