The following bug has been logged on the website:
Bug reference: 14061
Logged by: Ondřej Světlík
Email address: ondrej(at)svetlik(dot)info
PostgreSQL version: 9.5.2
Operating system: Fedora 22
Description:
dnf upgrade -y
...
Error: Package postgresql95-9.5.2-1PGDG.f22.x86_64.rpm is not signed