/usr/share/kde4/apps/libkface/ is in libkface-data 1.0~digikam3.5.0-0ubuntu10.
This file is owned by root:root, with mode 0o755.
..
/usr/share/kde4/apps/libkface/alignment-congealing/
/usr/share/kde4/apps/libkface/alignment-congealing/face-funnel.data
/usr/share/kde4/apps/libkface/database/
/usr/share/kde4/apps/libkface/database/dbconfig.xml
/usr/share/kde4/apps/libkface/haarcascades/
/usr/share/kde4/apps/libkface/haarcascades/haarcascade_frontalface_alt.xml
/usr/share/kde4/apps/libkface/haarcascades/haarcascade_frontalface_alt2.xml
/usr/share/kde4/apps/libkface/haarcascades/haarcascade_frontalface_alt_tree.xml
/usr/share/kde4/apps/libkface/haarcascades/haarcascade_frontalface_default.xml
/usr/share/kde4/apps/libkface/haarcascades/haarcascade_mcs_lefteye.xml
/usr/share/kde4/apps/libkface/haarcascades/haarcascade_mcs_mouth.xml
/usr/share/kde4/apps/libkface/haarcascades/haarcascade_mcs_nose.xml
/usr/share/kde4/apps/libkface/haarcascades/haarcascade_mcs_righteye.xml
/usr/share/kde4/apps/libkface/haarcascades/haarcascade_profileface.xml