accepted connection from pid 1, user root

Starting download of /tmp/guix-file.HJ7I9i
From https://www.python.org/ftp/python/3.6.4/Python-3.6.4.tar.xz...
ERROR: X.509 certificate of 'www.python.org' could not be verified:
  insecure-algorithm
  signer-not-found
  invalid

failed to download "/tmp/guix-file.HJ7I9i" from "https://www.python.org/ftp/python/3.6.4/Python-3.6.4.tar.xz"
guix download: error: https://www.python.org/ftp/python/3.6.4/Python-3.6.4.tar.xz: download failed