Yep. Even simple `dnf upgrade -y && dnf updrade --releasever=30 -y` should work, because difference between releases is small enough. (No groundbreaking changes

Yep. Even simple `dnf upgrade -y && dnf updrade --releasever=30 -y` should work, because difference between releases is small enough. (No groundbreaking changes). I did upgrade from Fedora 26 to Fedora 28 using simple upgrade. Recommended command for system upgrade is `sudo dnf system-upgrade download --refresh --releasever=30` then `sudo dnf system-upgrade reboot` .