If you start getting shitty fucking error messages like
manpath: can't set the locale; make sure $LC_* and $LANG are correct
whenever you start up a WSL shell, your system locales are all fucked to insane buggery and you need to unfuck them pronto.
You can do this by running the official locale-unfucking command:
sudo dpkg-reconfigure locales This launches some neolithic tool where you can pick the locales you want to install. I've noticed that because WSL is fucking terrible and shit at everything, if you select only en_GB locales it fucks itself hard right in the festering facewound because it's still looking for en_US.*, so you'd better pick all the en_US.* ones as well, and that'll unfuck it right up.