/usr/lib/ is in python-xdg 0.19-3ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python2.7/
/usr/lib/python2.7/dist-packages/
/usr/lib/python2.7/dist-packages/xdg/
/usr/lib/python2.7/dist-packages/xdg/BaseDirectory.py
/usr/lib/python2.7/dist-packages/xdg/DesktopEntry.py
/usr/lib/python2.7/dist-packages/xdg/Exceptions.py
/usr/lib/python2.7/dist-packages/xdg/IconTheme.py
/usr/lib/python2.7/dist-packages/xdg/IniFile.py
/usr/lib/python2.7/dist-packages/xdg/Menu.py
/usr/lib/python2.7/dist-packages/xdg/Mime.py
/usr/lib/python2.7/dist-packages/xdg/RecentFiles.py
/usr/lib/python2.7/dist-packages/xdg/Locale.py
/usr/lib/python2.7/dist-packages/xdg/Config.py
/usr/lib/python2.7/dist-packages/xdg/__init__.py
/usr/lib/python2.7/dist-packages/xdg/MenuEditor.py
/usr/lib/python2.7/dist-packages/pyxdg-0.19.egg-info