I attempted this past Friday to upgrade our 3.1 SR4 Enterprise server to the September 2017 release. And it failed after all steps appeared to work accurately. I've been doing more reading to see if I need to modify the Postgres superuser password, among other things. But rather than blindly continuing, I thought I would see if anyone can decipher what might have gone wrong, and guide me in the proper direction.
Thank you... that article helped... until we ran into other issues trying to restore the database into the newer 9.6 version. So, we're back to square one, but you definitely helped me get farther than the last time. I appreciate it!