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/usr/share/postgresql/10/extension/plpgsql.control is in postgresql-10 10.6-0ubuntu0.18.04.1.

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# plpgsql extension
comment = 'PL/pgSQL procedural language'
default_version = '1.0'
module_pathname = '$libdir/plpgsql'
relocatable = false
schema = pg_catalog
superuser = false