Can't upgrade to F31 due to "could not do untrusted question as no klass support"
gnome-software-3.32.4-1.fc30.x86_64
I modified ~/.cache/gnome-software/fedora-pkgdb-collections/fedora.json
to mark Fedora 31 as active, restarted gnome-software, went to the updates, and clicked to have my system updated to Fedora 31. This error popped up, with no explanation as to what the problem is, and how it could be fixed. This is just cryptic, and impossible to fix unless one googles the error message.
It looks like it's related to one of the repositories having GPG disabled (?): https://bugzilla.redhat.com/show_bug.cgi?id=1647747
In any case, the error message isn't actionable.