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/usr/share/postgresql/9.5/extension/plpgsql.control is in postgresql-9.5 9.5.14-0ubuntu0.16.04.

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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