If you get the error

this is probably because the system did not get a network connection working. This could be for a number of reasons, including bad cabling, connecting the network cable to the wrong interface or driver incompatibility. Make sure your connectivity and drivers are working well with the OS.

This happens on some Fedora 19 to 21 upgrades, but also after installing desktop components or VNC.

</div>

if you see something like --conf-file=/var/lib/libvirt/dnsmasq/default.conf then you can fix the dnsmasq problem by issuing the following command and then rebooting.

<div style="border: 1px solid #A3B1BF; padding: .5em 1em; color: #000; background-color: #E6F2FF; margin: 3px 3px 1em 3px; text-align: left">

sudo reboot

</div>