May 012018
 

When attempting to upgrade from Fedora Core 27 to Fedora Core 28, it may fail on the nss-pem package.

 

I spent some time trying to find the solution for this, and came across numerous posts on the “Red Hat Bugzilla”, particularly this post.

See below example:

[root@SYSTEMZ01 ~]# dnf system-upgrade download --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
Fedora 28 - x86_64 - Updates                                                                                                                                $
Fedora 28 - x86_64                                                                                                                                          $
google-chrome                                                                                                                                               $
RPM Fusion for Fedora 28 - Free - Updates                                                                                                                   $
RPM Fusion for Fedora 28 - Free                                                                                                                             $
RPM Fusion for Fedora 28 - Nonfree - Updates                                                                                                                $
RPM Fusion for Fedora 28 - Nonfree                                                                                                                          $
skype (stable)                                                                                                                                              $
Last metadata expiration check: 0:00:00 ago on Tue 01 May 2018 04:28:04 PM MDT.
Error:
 Problem: 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

To resolve this, manually install the nss-pem packages from FC28 prior to the upgrade using the following command.

dnf install nss-pem-1.0.3-9.fc28 --releasever=28

After doing so, re-attempt to upgrade and the upgrade should now proceed.