The small problem. I keep my own repository of certain packages not available through other means on my main desktop accessed though autofs//nfs. 

The software center was able to access the metadata during the download phase but system-upgrade apparently didn't download the packages assuming they were local. I remember filing a bug for this with fedup...

The bigger issue is everything says Fedora 26 (/etc/fedora-release) and Gnome system information, but when I run dnf it's still looking at the Fedora 25 repos. 

Where does dnf look for $releasever?

Thanks,

Richard