Fedora 27 has reached its end of life

As of today, Fedora 27 will not be getting any more updates, including security updates. Users should be planning to upgrade more or less immediately. 'Fedora 28 will continue to receive
updates until 4 weeks after the release of Fedora 30.
The maintenance schedule of Fedora releases is documented on the
Fedora Project wiki. The Fedora Project wiki also contains
instructions on how to upgrade from a previous release of Fedora
to a version receiving updates.'