/usr/share/postgresql/10/extension/lo--unpackaged--1.0.sql is in postgresql-10 10.6-0ubuntu0.18.04.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | /* contrib/lo/lo--unpackaged--1.0.sql */
-- complain if script is sourced in psql, rather than via CREATE EXTENSION
\echo Use "CREATE EXTENSION lo FROM unpackaged" to load this file. \quit
ALTER EXTENSION lo ADD domain lo;
ALTER EXTENSION lo ADD function lo_oid(lo);
ALTER EXTENSION lo ADD function lo_manage();
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