On Wed, 4 Nov 2020 15:50:17 +0100 (CET)
musics--- via Bug reports for GNU Guix <bug-guix@gnu.org> wrote:

> Many thanks to Danny and Tobias
> I changed the config.scm file, after running "sudo guix system reconfigure /etc/config.scm" it displayed:
> /etc/config.scm:31:6: error: network-manager-type: unbound variable
> hint: Did you forget a ʻuse-modules' form?

I'm sorry, I made a typo in the suggestion.

It should have been:

            (modify-services %desktop-services
              (network-manager-service-type config =>
                (network-manager-configuration
                  (inherit config)
                  (vpn-plugins
                   (list network-manager-openvpn)))))