/usr/share/kde4/apps/plasma/layout-templates/ is in plasma-desktop 4:4.11.8-0ubuntu6.
This file is owned by root:root, with mode 0o755.
..
/usr/share/kde4/apps/plasma/layout-templates/org.kde.plasma-desktop.SaL/
/usr/share/kde4/apps/plasma/layout-templates/org.kde.plasma-desktop.SaL/contents/
/usr/share/kde4/apps/plasma/layout-templates/org.kde.plasma-desktop.SaL/contents/layout.js
/usr/share/kde4/apps/plasma/layout-templates/org.kde.plasma-desktop.SaL/metadata.desktop
/usr/share/kde4/apps/plasma/layout-templates/org.kde.plasma-desktop.defaultPanel/
/usr/share/kde4/apps/plasma/layout-templates/org.kde.plasma-desktop.defaultPanel/contents/
/usr/share/kde4/apps/plasma/layout-templates/org.kde.plasma-desktop.defaultPanel/contents/layout.js
/usr/share/kde4/apps/plasma/layout-templates/org.kde.plasma-desktop.defaultPanel/metadata.desktop
/usr/share/kde4/apps/plasma/layout-templates/org.kde.plasma-desktop.desktopIcons/
/usr/share/kde4/apps/plasma/layout-templates/org.kde.plasma-desktop.desktopIcons/contents/
/usr/share/kde4/apps/plasma/layout-templates/org.kde.plasma-desktop.desktopIcons/contents/layout.js
/usr/share/kde4/apps/plasma/layout-templates/org.kde.plasma-desktop.desktopIcons/metadata.desktop
/usr/share/kde4/apps/plasma/layout-templates/org.kde.plasma-desktop.findWidgets/
/usr/share/kde4/apps/plasma/layout-templates/org.kde.plasma-desktop.findWidgets/contents/
/usr/share/kde4/apps/plasma/layout-templates/org.kde.plasma-desktop.findWidgets/contents/layout.js
/usr/share/kde4/apps/plasma/layout-templates/org.kde.plasma-desktop.findWidgets/metadata.desktop
/usr/share/kde4/apps/plasma/layout-templates/org.kde.plasma-desktop.photoActivity/
/usr/share/kde4/apps/plasma/layout-templates/org.kde.plasma-desktop.photoActivity/contents/
/usr/share/kde4/apps/plasma/layout-templates/org.kde.plasma-desktop.photoActivity/contents/layout.js
/usr/share/kde4/apps/plasma/layout-templates/org.kde.plasma-desktop.photoActivity/metadata.desktop