/usr/share/postgresql/10/extension/seg.control 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 | # seg extension
comment = 'data type for representing line segments or floating-point intervals'
default_version = '1.1'
module_pathname = '$libdir/seg'
relocatable = true
|