/usr/share/blender/scripts/addons/yafaray/ui/ is in yafaray-exporter 0.1.2+really0.1.2~beta5-3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/blender/scripts/addons/yafaray/ui/__init__.py
/usr/share/blender/scripts/addons/yafaray/ui/ior_values.py
/usr/share/blender/scripts/addons/yafaray/ui/properties_yaf_AA_settings.py
/usr/share/blender/scripts/addons/yafaray/ui/properties_yaf_camera.py
/usr/share/blender/scripts/addons/yafaray/ui/properties_yaf_general_settings.py
/usr/share/blender/scripts/addons/yafaray/ui/properties_yaf_integrator.py
/usr/share/blender/scripts/addons/yafaray/ui/properties_yaf_light.py
/usr/share/blender/scripts/addons/yafaray/ui/properties_yaf_material.py
/usr/share/blender/scripts/addons/yafaray/ui/properties_yaf_object.py
/usr/share/blender/scripts/addons/yafaray/ui/properties_yaf_render.py
/usr/share/blender/scripts/addons/yafaray/ui/properties_yaf_strand.py
/usr/share/blender/scripts/addons/yafaray/ui/properties_yaf_texture.py
/usr/share/blender/scripts/addons/yafaray/ui/properties_yaf_volume_integrator.py
/usr/share/blender/scripts/addons/yafaray/ui/properties_yaf_world.py