Re: pg_upgrade from 12 to 13 failes with plpython2

Marcin Giedz <marcin.giedz@arise.pl> writes:
> all DBs checked and no plpython(2u) is found except for plpython3u 

I think you also need to make sure you've dropped the plpythonu
and plpython2u extensions in every database.

            regards, tom lane