$ dnf system-upgrade download –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
…
Si intentamos desisntalar este paquete, veremos que es una dependencia de Wine 😦 Para solucionarlo tenemos que hacer esto:
dnf install nss-pem-1.0.3-9.fc28 –releasever=28
dnf system-upgrade download –releasever=28