How to upgrade a postgresql database?

[Peter Nabbefeld <peter.nabbefeld@xxxxxx>]

Hello,

I'm trying to upgrade a postgresql database, but it doesn't work. I've 
also found this: 
https://wiki.archlinux.org/index.php/PostgreSQL#Upgrading_PostgreSQL

This doesn't work for me, because there isn't any folder 
/opt/pgsql-9.6/bin anymore - all the binaries are in /usr/bin. This 
implies, there're no two versions of the binaries available, nor any 
oldir or newdir (for -b / -B parameters).

It seems, I have to downgrade postgresql first, dump the database, and 
restore it after upgrading again. Is there any easier method available 
(i.e. some script which could do this automatically)?

Kind regards

Peter