sudo dnf system-upgrade download --refresh --releasever=28 Error: Problem 1: nss-pem-1.0.3-6.fc27.i686 has inferior architecture - nss-pem-1.0.3-6.fc27.x86_64 does not belong to a distupgrade repository - problem with installed package nss-pem-1.0.3-6.fc27.i686
*** This bug has been marked as a duplicate of bug 1553646 ***