I've installed antiX Linux (v19.3), with a certain locale (let's say it's xx\_XX.UTF-8). After installation, I've had a change of heart and want the locale for all users to be/to default to something else (yy\_YY.UTF-8).

How do I make that change *comprehensively* (i.e. leaving no user, app or configuration file believing the locale is or used to be xx\_XX.UTF-8)?

Note: Answers about Debian-based distributions in general are also ok.