Not possible
https://www.postgresql.org/download/linux/debian/
To upgrade I do: apt-get install postgresql-9.3
There is no way to "roll back" from here.
I can not choose which version to install, it install the latest version packed for debian. Currently its 9.3.16
The docuntation says that upgrading minor version is just "replacing the executables", so there has to be a way to save them on the side for roll back.
If not, the documntation is insuffecent. We all know that sometimes even the smallest change can cause troubles.
Well - if you choose apt as you package-manager then this is really not an issue for PostgreSQL. What you're really asking is how to make apt install (or downgrade) a specific minor-version even if an updated version exists in the package-repo. Maybe you'll have more luck asking that other places than a PG-mailing-list.
--
Andreas Joseph Krogh
