Nothing was actually processed regarding #1568484 I reported.

$ dnf list installed | grep -i fedora-upgrade

fedora-upgrade.noarch 28.1-2.fc28 @fedora

'# dnf --refresh -y upgrade'

...

Dependencies resolved. Nothing to do.

$ lsb_release -a

...

Description: Fedora release 28 (Twenty Eight)

$ uname -r

4.16.2-300.fc28.x86_64

'# fedora-upgrade'

Going to upgrade your Fedora to rawhide.

Fedora 29 is currently under development.

Are you sure? Hit Enter to continue or Ctrl + C to cancel.

Going to resolve old .rpmsave and .rpmnew files before upgrading. This step is highly recommended, but can be safely skipped. Hit Enter to continue, Ctrl + C to cancel or S + Enter to skip.

'# '

karma: -1

Above run under stable release. Current test obsoletes previous test

Correction; 'fedora-upgrade.noarch 28.2-1.fc28 @updates-testing'

Result unchanged.

karma: -1

??? I completly do not get what you are trying to say? Sorry. Can you comment rathe on the BZ?

Many times '?'; it must be real then. Nothing to try for me or for anyone else. Results matter.

... Checking if rpmconf is installed. Checking if dnf-plugins-core is installed.

Going to resolve old .rpmsave and .rpmnew files before upgrading. ... Checking if fedora-repos-rawhide is installed. Fedora - Rawhide - Developmental packages for the next Fedora release 9.2 MB/s | 61 MB 00:06
Last metadata expiration check: 0:00:31 ago on Thu 19 Apr 2018 13:10:31 CEST. Dependencies resolved. ======================================================================================================= Package Arch Version Repository Size ======================================================================================================= Upgrading: dnf noarch 2.7.5-11.fc29 rawhide 352 k dnf-conf noarch 2.7.5-11.fc29 rawhide 70 k dnf-yum noarch 2.7.5-11.fc29 rawhide 51 k python3-dnf noarch 2.7.5-11.fc29 rawhide 490 k

Transaction Summary

Upgrade 4 Packages

Total download size: 962 k Downloading Packages: (1/4): dnf-conf-2.7.5-11.fc29.noarch.rpm 166 kB/s | 70 kB 00:00
(2/4): dnf-2.7.5-11.fc29.noarch.rpm 645 kB/s | 352 kB 00:00
(3/4): python3-dnf-2.7.5-11.fc29.noarch.rpm 824 kB/s | 490 kB 00:00
(4/4): dnf-yum-2.7.5-11.fc29.noarch.rpm 294 kB/s | 51 kB 00:00

Total 704 kB/s | 962 kB 00:01
warning: /var/cache/dnf/rawhide-2d95c80a1fa0a67d/packages/dnf-2.7.5-11.fc29.noarch.rpm: Header V3 RSA/SHA256 Signature, key ID 429476b4: NOKEY Importing GPG key 0x9DB62FB1: Userid : "Fedora 28 (28) fedora-28@fedoraproject.org" Fingerprint: 128C F232 A937 1991 C8A6 5695 E08E 7E62 9DB6 2FB1 From : /etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-28-x86_64 Key imported successfully Import of key(s) didn't help, wrong key(s)? Public key for dnf-2.7.5-11.fc29.noarch.rpm is not installed. Failing package is: dnf-2.7.5-11.fc29.noarch GPG Keys are configured as: file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-28-x86_64 Public key for python3-dnf-2.7.5-11.fc29.noarch.rpm is not installed. Failing package is: python3-dnf-2.7.5-11.fc29.noarch GPG Keys are configured as: file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-28-x86_64 Public key for dnf-conf-2.7.5-11.fc29.noarch.rpm is not installed. Failing package is: dnf-conf-2.7.5-11.fc29.noarch GPG Keys are configured as: file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-28-x86_64 Public key for dnf-yum-2.7.5-11.fc29.noarch.rpm is not installed. Failing package is: dnf-yum-2.7.5-11.fc29.noarch GPG Keys are configured as: file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-28-x86_64 The downloaded packages were saved in cache until the next successful transaction. You can remove cached packages by executing 'dnf clean packages'. Error: GPG check FAILED