The offline update failed in an unexpected way.

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I have the same problem with a 64-bit Fedora 22 VM running in Virtual Box. A 32-bit VM otherwise configured identically upgraded without a hitch. The 64-bit VM refuses to upgrade. I tried 6 or 7 times, on two consecutive days. Manually connecting works fine. I've also tried updating /etc/resolv.conf manually to point to the Google name servers, to disable IPv6 (following a suggestion for a similar issue), but none of these changes seems to persist across the reboot.

Note sure why Fedora needs a reboot before it does its upgrades. In Ubuntu, the reboot occurs after the currently running OS downloaded everything. This makes more sense. Here, it's very hard to debug, because the problem occurs right after reboot, in an OS that is completely on "auto-pilot" during the upgrade, so there's little you can do in terms of investigation. So it tells me something fails, but gives me zero opportunity to fix it.

Please try it again. This meant that the update tool was unable to download the required packages for an update. Do make sure that you have network connectivity.