> > You should use 'dpkg-reconfigure locales'. >
I actually tried `sudo dpkg-reconfigure locales`, but C.UTF-8 is not even on the list, so I can only remove en_US.UTF-8 there. Then I did `sudo update-locale LANG=C.UTF-8`. As far as I know, these steps basically modifies /etc/locale.gen, runs locale-gen, and modifies /etc/default/locale.