====== Downloading failed: Didn't install any keys ======
<code>
$ sudo fedup --network 21 --product=workstation
setting up repos...
default-installrepo/metalink                                          | 5.9 kB  00:00:00     
google-chrome                                                         |  951 B  00:00:00     
rpmfusion-free-updates/21/x86_64                                      | 2.7 kB  00:00:00     
rpmfusion-nonfree-updates/21/x86_64                                   | 2.7 kB  00:00:00     
updates/21/x86_64/metalink                                            | 4.8 kB  00:00:00     
getting boot images...
.treeinfo.signed                                                      | 2.1 kB  00:00:00     
setting up update...
Warning: Group core does not have any packages to install.
Warning: Group base-x does not have any packages to install.
finding updates 100% [==================================================================]
verify local files 100% [===============================================================]
warning: /var/cache/system-upgrade/rpmfusion-nonfree/packages/rpmfusion-nonfree-release-
21-1.noarch.rpm: Header V3 RSA/SHA256 Signature, key ID a668b376: NOKEY
Importing GPG key 0xA668B376:
 Userid     : "RPM Fusion nonfree repository for Fedora (21) <rpmfusion-buildsys@lists
.rpmfusion.org>"
 Fingerprint: e160 058e f06f a4c3 c15d 0f86 0174 46d1 a668 b376
 Package    : rpmfusion-nonfree-release-20-1.noarch (installed)
 From       : /etc/pki/rpm-gpg/RPM-GPG-KEY-rpmfusion-nonfree-fedora-21

Downloading failed: Didn't install any keys
</code>
\\

[[http://rpmfusion.org/Configuration/|Configuration - RPM Fusion]]よりパッケージをインストールする。\\
<code>
$ sudo yum install http://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-21.noarch.rpm
$ sudo yum install http://download1.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-21.noarch.rpm
</code>

===== 参考文献 =====
[[https://fedoraproject.org/wiki/Common_F21_bugs|Common F21 bugs]]\\