Upgrading from F26 to Rawhide (28) currently fails, as F26 does not have the F28 GPG keys: /etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-28* are missing on F26 (present on F27 and Rawhide).
Proposing as a Beta blocker as a violation of Beta criterion "For each one of the release-blocking package sets, it must be possible to successfully complete a direct upgrade from fully updated installations of the last two stable Fedora releases with that package set installed."
fedora-repos-26-2 has been submitted as an update to Fedora 26. https://bodhi.fedoraproject.org/updates/FEDORA-2018-319eef8bad
fedora-repos-26-2 has been pushed to the Fedora 26 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2018-319eef8bad
Discussed at 2018-01-08 blocker review meeting: [1]. This bug was accepted as previous release blocker (needs to be fixed in previous version): this is accepted as a 'previous release' blocker, meaning it needs fixing in F26 before F28 can go out, as a violation of Beta criterion "For each one of the release-blocking package sets, it must be possible to successfully complete a direct upgrade from fully updated installations of the last two stable Fedora releases with that package set installed" [1] https://meetbot-raw.fedoraproject.org/fedora-blocker-review/2018-01-08/
fedora-repos-26-2 has been pushed to the Fedora 26 stable repository. If problems still persist, please make note of it in this bug report.