Read this Antonio: https://fedoramagazine.org/upgrading-fedora-27-fedora-28/

"If you have issues when upgrading because of packages without updates, broken dependencies, or retired packages, add the ‐‐allowerasing flag when typing the above command. This will allow DNF to remove packages that may be blocking your system upgrade."

This flag fixed that error for me.

Regards,

John Quirke

On 1 May 2018 at 19:26, Antonio M <antonio.montagnani@gmail.com> wrote:

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??