/usr/lib/python2.7/dist-packages/trytond/modules/account_dunning/view/ is in tryton-modules-account-dunning 4.2.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python2.7/dist-packages/trytond/modules/account_dunning/view/configuration_form.xml
/usr/lib/python2.7/dist-packages/trytond/modules/account_dunning/view/dunning_create_start_form.xml
/usr/lib/python2.7/dist-packages/trytond/modules/account_dunning/view/dunning_form.xml
/usr/lib/python2.7/dist-packages/trytond/modules/account_dunning/view/dunning_level_form.xml
/usr/lib/python2.7/dist-packages/trytond/modules/account_dunning/view/dunning_level_list.xml
/usr/lib/python2.7/dist-packages/trytond/modules/account_dunning/view/dunning_level_list_sequence.xml
/usr/lib/python2.7/dist-packages/trytond/modules/account_dunning/view/dunning_list.xml
/usr/lib/python2.7/dist-packages/trytond/modules/account_dunning/view/dunning_procedure_form.xml
/usr/lib/python2.7/dist-packages/trytond/modules/account_dunning/view/dunning_procedure_list.xml
/usr/lib/python2.7/dist-packages/trytond/modules/account_dunning/view/dunning_process_start_form.xml
/usr/lib/python2.7/dist-packages/trytond/modules/account_dunning/view/party_form.xml