Created attachment 1406280 [details]
Gnome Software json
Description of problem:
Gnome Software should offer upgrade from Fedora 26 to Fedora 28 after:
gsettings set org.gnome.software show-upgrade-prerelease true
Fedora 28 entry is in cache/gnome-software/3.24/upgrades/fedora.json (attached).
Version-Release number of selected component (if applicable):
(I've tested both stable and updates-testing version)
Steps to Reproduce:
1. gsettings set org.gnome.software show-upgrade-prerelease true
2. Launch Gnome Software
Gnome Software offers you upgrade to F27
You should see offer to upgrade from F26 to F28
Proposed as a Blocker for 28-beta by Fedora user frantisekz using the blocker tracking app because:
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.
This criterion applies to the recommended upgrade mechanisms only.
Discussed during the 2018-03-12 blocker review meeting: 
The decision to classify this bug as an AcceptedBlocker was made as it violates the following blocker criteria for the Workstation install:
"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"
Fixed upstream in https://gitlab.gnome.org/GNOME/gnome-software/commit/c04bf023d6d0ba50d3c7a27403dcc3c052ed22e7
I'll do a F26 build.
gnome-software-3.24.3-5.fc26 has been submitted as an update to Fedora 26. https://bodhi.fedoraproject.org/updates/FEDORA-2018-3fd0a5f75f
gnome-software-3.24.3-5.fc26 offers upgrade to F28.
gnome-software-3.24.3-5.fc26 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-2018-3fd0a5f75f
This should have been accepted as a previous release blocker, since it needs to be resolved in 26, not 28. (Geoff, not your fault, I should have noticed this during the meeting and put it in the #agreed). Adjusting.
gnome-software-3.24.3-5.fc26 has been pushed to the Fedora 26 stable repository. If problems still persist, please make note of it in this bug report.