Hello Ricardo. I made a typo: I do not need a root for `build`.
How it really was: `guix system build -n config.scm` ---> 3 packages download sudo guix system _RECONFIGURE_ config.scm ---> Hey-ho: building Linux! C-c edit config.scm, use kernel that has substitute. guix build -n config.scm --substitute-url=URL ---> Will download Linux. sudo guix sytem reconfugure config.scm ---> download, apply. ahm cool. --- Am sorry, Vitaliy.
