I checked now the folder where the key should be. I have only "RPM-GPG-KEY-fedora-24-x86_64" and not that one for fedora 25. Maybe this causes the problem. So I try now to install first the fedora 24 version and than the upgrade at 25.
-- You received this message because you are subscribed to the Google Groups "qubes-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to qubes-users+unsubscr...@googlegroups.com. To post to this group, send email to email@example.com. To view this discussion on the web visit https://groups.google.com/d/msgid/qubes-users/2634b84b-5d26-4d66-80a7-750cf8d76715%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.