guix pull error after install i686 1.2.0

[Bone Baboon]

I have just installed Guix on a computer using:
https://ftp.gnu.org/gnu/guix/guix-system-install-1.2.0.i686-linux.iso.xz

When I run `guix pull` I get this error message "guix pull: error: Git
error: the SSL certificate is invalid".