/usr/share/postgresql/9.5/extension/ltree_plpythonu.control is in postgresql-plpython-9.5 9.5.2-1.
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 | # ltree_plpythonu extension
comment = 'transform between ltree and plpythonu'
default_version = '1.0'
module_pathname = '$libdir/ltree_plpython2'
relocatable = true
requires = 'ltree,plpythonu'
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