/usr/share/kde4/services/qimageioplugins/ is in kdelibs5-data 4:4.14.16-0ubuntu3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/kde4/services/qimageioplugins/bmp.desktop
/usr/share/kde4/services/qimageioplugins/dds.desktop
/usr/share/kde4/services/qimageioplugins/eps.desktop
/usr/share/kde4/services/qimageioplugins/exr.desktop
/usr/share/kde4/services/qimageioplugins/gif.desktop
/usr/share/kde4/services/qimageioplugins/hdr.desktop
/usr/share/kde4/services/qimageioplugins/ico.desktop
/usr/share/kde4/services/qimageioplugins/jp2.desktop
/usr/share/kde4/services/qimageioplugins/jpeg.desktop
/usr/share/kde4/services/qimageioplugins/mng.desktop
/usr/share/kde4/services/qimageioplugins/pbm.desktop
/usr/share/kde4/services/qimageioplugins/pcx.desktop
/usr/share/kde4/services/qimageioplugins/pgm.desktop
/usr/share/kde4/services/qimageioplugins/pic.desktop
/usr/share/kde4/services/qimageioplugins/png.desktop
/usr/share/kde4/services/qimageioplugins/pnm.desktop
/usr/share/kde4/services/qimageioplugins/ppm.desktop
/usr/share/kde4/services/qimageioplugins/psd.desktop
/usr/share/kde4/services/qimageioplugins/ras.desktop
/usr/share/kde4/services/qimageioplugins/rgb.desktop
/usr/share/kde4/services/qimageioplugins/svg+xml-compressed.desktop
/usr/share/kde4/services/qimageioplugins/svg+xml.desktop
/usr/share/kde4/services/qimageioplugins/tga.desktop
/usr/share/kde4/services/qimageioplugins/tiff.desktop
/usr/share/kde4/services/qimageioplugins/xbm.desktop
/usr/share/kde4/services/qimageioplugins/xcf.desktop
/usr/share/kde4/services/qimageioplugins/xpm.desktop
/usr/share/kde4/services/qimageioplugins/xv.desktop