I had the same problem, which was solved by installing glibc-utf8-locales
in root's profile and adding the export line to root's ~/.profile, which
fits Ricardo's explanations.

Le jeu. 17 janv. 2019 à 21:56, Quiliro Ordonez <quiliro@riseup.net> a
écrit :

> Thank you for this straightforward answer Ricardo. I post some insights
> below.
>
> El 2019-01-17 09:24, Ricardo Wurmus escribió:
> > This is in your environment.  But what about the daemon’s environment?
> > It is not started in your environment where GUIX_LOCPATH is set.  How do
> > you start the daemon?  If it’s via systemd you may want to look at the
> > service file to see where GUIX_LOCPATH points.
>
> In fact:
> echo $GUIX_LOCPATH
> gives no output as root (which runs the Guix daemon, presumably).
>
> Where is the service file supposed to be and how to include GUIX_LOCPATH
> in it?
>
> I also ran the script to install Guix. Perhaps this script should do all
> the setup.
>
>