stan <stanb(at)panix(dot)com> writes:
> I am working on upgrading from V11 to V12 on Debian.
> My first attempt failed, and I have figured out that this is because I have
> added extensions to the V11 DB, at least one of which was not installed
> using the Debian packages.
> So, it looks like i need to install these before doing the upgrade, correct?
Yes, but in this context, "install" only means "add the files to the
filesystem". You don't need to do CREATE EXTENSION in the new
database; pg_upgrade will handle that when it transfers the data.
regards, tom lane