fedup failure

[Greg Woods]

I am trying to upgrade my Sony Vaio laptop from F19 to F20, using "fedup
--network 20". I get an error in the GPG key verification:

warning: /var/tmp/system-upgrade/updates/packages/NetworkManager-0.9.9.0-32.git20131003.fc20.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID 246110c1: NOKEY

Downloading failed: GPG key retrieval failed: [Errno 14] curl#37 -
"Couldn't open file /etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-x86_64"

...and, in fact, there is no such file. There is no such file on any of
my other F19 systems either, so I don't know how to fix this. Any ideas
from those more familiar with the inner workings of fedup?

Thanks,
--Greg