/usr/lib/python2.7/dist-packages/sage_setup/ is in sagemath-common 8.1-7ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python2.7/dist-packages/sage_setup/__init__.py
/usr/lib/python2.7/dist-packages/sage_setup/autogen/
/usr/lib/python2.7/dist-packages/sage_setup/autogen/__init__.py
/usr/lib/python2.7/dist-packages/sage_setup/autogen/__main__.py
/usr/lib/python2.7/dist-packages/sage_setup/autogen/interpreters/
/usr/lib/python2.7/dist-packages/sage_setup/autogen/interpreters/__init__.py
/usr/lib/python2.7/dist-packages/sage_setup/autogen/interpreters/__main__.py
/usr/lib/python2.7/dist-packages/sage_setup/autogen/interpreters/generator.py
/usr/lib/python2.7/dist-packages/sage_setup/autogen/interpreters/instructions.py
/usr/lib/python2.7/dist-packages/sage_setup/autogen/interpreters/memory.py
/usr/lib/python2.7/dist-packages/sage_setup/autogen/interpreters/specs/
/usr/lib/python2.7/dist-packages/sage_setup/autogen/interpreters/specs/__init__.py
/usr/lib/python2.7/dist-packages/sage_setup/autogen/interpreters/specs/base.py
/usr/lib/python2.7/dist-packages/sage_setup/autogen/interpreters/specs/cc.py
/usr/lib/python2.7/dist-packages/sage_setup/autogen/interpreters/specs/cdf.py
/usr/lib/python2.7/dist-packages/sage_setup/autogen/interpreters/specs/element.py
/usr/lib/python2.7/dist-packages/sage_setup/autogen/interpreters/specs/python.py
/usr/lib/python2.7/dist-packages/sage_setup/autogen/interpreters/specs/rdf.py
/usr/lib/python2.7/dist-packages/sage_setup/autogen/interpreters/specs/rr.py
/usr/lib/python2.7/dist-packages/sage_setup/autogen/interpreters/storage.py
/usr/lib/python2.7/dist-packages/sage_setup/autogen/interpreters/utils.py
/usr/lib/python2.7/dist-packages/sage_setup/clean.py
/usr/lib/python2.7/dist-packages/sage_setup/docbuild/
/usr/lib/python2.7/dist-packages/sage_setup/docbuild/__init__.py
/usr/lib/python2.7/dist-packages/sage_setup/docbuild/__main__.py
/usr/lib/python2.7/dist-packages/sage_setup/docbuild/build_options.py
/usr/lib/python2.7/dist-packages/sage_setup/docbuild/ext/
/usr/lib/python2.7/dist-packages/sage_setup/docbuild/ext/__init__.py
/usr/lib/python2.7/dist-packages/sage_setup/docbuild/ext/inventory_builder.py
/usr/lib/python2.7/dist-packages/sage_setup/docbuild/ext/multidocs.py
/usr/lib/python2.7/dist-packages/sage_setup/docbuild/ext/sage_autodoc.py
/usr/lib/python2.7/dist-packages/sage_setup/docbuild/sphinxbuild.py
/usr/lib/python2.7/dist-packages/sage_setup/find.py
/usr/lib/python2.7/dist-packages/sage_setup/optional_extension.py
/usr/lib/python2.7/dist-packages/sage_setup/util.py