Locale error message

The error message on a new Debian installation:

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

Running

dpkg-reconfigure locales

did not work.

What worked was:

update-locale LANG=en_IN