this is the full output

dnf system-upgrade download --refresh --releasever=28
Before you continue ensure that your system is fully upgraded by running "dnf --refresh upgrade". Do you want to continue [y/N]: y
Ultima verifica della scadenza dei metadati: 0:00:00 fa il mar 01 mag 2018 20:24:38 CEST.
Errore:
 Problema: 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


Antonio Montagnani

Linux Fedora 27(Workstation)
da/from Gmail

2018-05-01 19:52 GMT+02:00 Antonio M <antonio.montagnani@gmail.com>:
When updating by dnf to F28, process fails saying that nss-pem has an inferior architecture (I have both i686 and 64 packages). Any idea??