Hi Guix,

using Guix on Ubuntu, I kept seeing messages “substitute: warning: 
failed to install locale: Invalid argument” (though apart from this 
warning, everything seemed to work normally).

 From a previous thread on this mailing list, I learnt that the 
 problem is that the daemon doesn't have GUIX_LOCPATH set correctly, 
 but I didn't know how to fix
this. #guix explained to me that, for systemd users, this can be done 
by adding "Environment=GUIX_LOCPATH=/root/.guix-profile/lib/locale" 
to the [Service] section of the guix-daemon.service file. (and 
probably also installing the necessary locales for root, which I'd 
already done).

Should this environment setting be added to the default 
guix-daemon.service, or could this break something for other 
users/distributions (I'm not sure systems other than Ubuntu have this 
problem?).

Thomas