/usr/lib/ is in tryton-modules-account-dunning-letter 4.2.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python2.7/dist-packages/trytond/modules/
/usr/lib/python2.7/
/usr/lib/python2.7/dist-packages/
/usr/lib/python2.7/dist-packages/trytond/
/usr/lib/python2.7/dist-packages/trytond/modules/account_dunning_letter/
/usr/lib/python2.7/dist-packages/trytond/modules/account_dunning_letter/__init__.py
/usr/lib/python2.7/dist-packages/trytond/modules/account_dunning_letter/dunning.py
/usr/lib/python2.7/dist-packages/trytond/modules/account_dunning_letter/dunning.xml
/usr/lib/python2.7/dist-packages/trytond/modules/account_dunning_letter/letter.odt
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/usr/lib/python2.7/dist-packages/trytond_account_dunning_letter-4.2.0.egg-info/entry_points.txt
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