Hi,
I just gave fedup a try and found myself confronted with this:
# yum update ...
# fedup --network 22 ... WARNING: potential problems with upgrade sqlitebrowser-3.5.1-1.fc21.x86_64 (replaced by sqlitebrowser-3.6.0-1.fc22.x86_64) requires sqlitebrowser-3.5.1-1.fc21.x86_64 (replaced by sqlitebrowser-3.6.0-1.fc22.x86_64) ... WARNING: problems were encountered during transaction test: broken dependencies sqlitebrowser-3.6.0-1.fc22.x86_64 requires sqlitebrowser-3.6.0-1.fc22.x86_64
?!?
Unfortunately, broken dependencies occur almost every time you use fedup, especially before final release. It's because it uses "update" instead of "distro-sync" mode [1]. If there are no serious breakages (regarding core system packages), just perform the upgrade and then run "dnf distro-sync" in the upgraded system to fix it.
Of course, it's great if you file tickets in bugzilla against those broken packages.