update-locale -V (return code: 13)
update-locale: Unable to write /etc/default/locale: Permission denied
update-locale --help (return code: 0)
Usage: update-locale [OPTIONS] [LANG=locale] [LC_NUMERIC=locale] ...
Options:
--help display this message and exit
--reset ignore variables defined in the locale file
--locale-file=FILE file containing locale variables
(Default: /etc/default/locale)
--no-checks do not perform sanity checks on locale variables