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2017-11-19 08:52:19 -0500 asked a question Why can I upgrade from fedora26 to fedora27?

I've followed the steps shown in https://fedoramagazine.org/upgrading-...

But after reboot, it does not perform the system upgrade at all and reboot again....

Below messages from journalctl:

nov 19 11:12:33 localhost.localdomain systemd[1]: Received SIGRTMIN+20 from PID 354 (plymouthd).
nov 19 11:12:34 localhost.localdomain systemd[1]: Received SIGRTMIN+20 from PID 354 (plymouthd).
nov 19 11:12:34 localhost.localdomain dnf[741]: Error: No se pudo sincronizar la caché para el repositorio 'updates'
nov 19 11:12:34 localhost.localdomain systemd[1]: dnf-system-upgrade.service: Main process exited, code=exited, status=1/FAILU
nov 19 11:12:34 localhost.localdomain systemd[1]: Failed to start System Upgrade using DNF.
nov 19 11:12:34 localhost.localdomain audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=dnf-system-
nov 19 11:12:34 localhost.localdomain systemd[1]: dnf-system-upgrade.service: Unit entered failed state.
nov 19 11:12:34 localhost.localdomain systemd[1]: dnf-system-upgrade.service: Failed with result 'exit-code'.
nov 19 11:12:34 localhost.localdomain systemd[1]: Rebooting: service failed
nov 19 11:12:34 localhost.localdomain systemd[1]: Stopped target Remote File Systems (Pre).
nov 19 11:12:34 localhost.localdomain systemd[1]: Starting Show Plymouth Reboot Screen...
nov 19 11:12:34 localhost.localdomain systemd[1]: Stopped target Sound Card.
nov 19 11:12:34 localhost.localdomain systemd[1]: Stopping Restore /run/initramfs on shutdown...
nov 19 11:12:34 localhost.localdomain systemd[1]: Stopping LVM2 PV scan on device 8:6...
nov 19 11:12:34 localhost.localdomain systemd[1]: Stopping Hostname Service...

Versions: python3-dnf-plugin-system-upgrade-2.0.3-1.fc26.noarch

How can I solve it?