/usr/share/dbus-1/interfaces/ is in kdelibs5-dev 4:4.14.16-0ubuntu3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/dbus-1/interfaces/org.freedesktop.PowerManagement.Inhibit.xml
/usr/share/dbus-1/interfaces/org.freedesktop.PowerManagement.xml
/usr/share/dbus-1/interfaces/org.kde.JobView.xml
/usr/share/dbus-1/interfaces/org.kde.JobViewServer.xml
/usr/share/dbus-1/interfaces/org.kde.JobViewV2.xml
/usr/share/dbus-1/interfaces/org.kde.KCookieServer.xml
/usr/share/dbus-1/interfaces/org.kde.KDirNotify.xml
/usr/share/dbus-1/interfaces/org.kde.KGlobalAccel.xml
/usr/share/dbus-1/interfaces/org.kde.KHTMLPart.xml
/usr/share/dbus-1/interfaces/org.kde.KIMIface.xml
/usr/share/dbus-1/interfaces/org.kde.KLauncher.xml
/usr/share/dbus-1/interfaces/org.kde.KMediaPlayer.xml
/usr/share/dbus-1/interfaces/org.kde.KPasswdServer.xml
/usr/share/dbus-1/interfaces/org.kde.KSpeech.xml
/usr/share/dbus-1/interfaces/org.kde.KWallet.xml
/usr/share/dbus-1/interfaces/org.kde.Solid.Networking.Client.xml
/usr/share/dbus-1/interfaces/org.kde.Solid.PowerManagement.PolicyAgent.xml
/usr/share/dbus-1/interfaces/org.kde.StatusNotifierItem.xml
/usr/share/dbus-1/interfaces/org.kde.StatusNotifierWatcher.xml
/usr/share/dbus-1/interfaces/org.kde.kded.xml
/usr/share/dbus-1/interfaces/org.kde.kglobalaccel.Component.xml
/usr/share/dbus-1/interfaces/org.kde.kio.FileUndoManager.xml