/usr/share/kde4/services/kded/notificationhelper.desktop is in kubuntu-notification-helper 14.04ubuntu11.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | [Desktop Entry]
Name=Notification Helper
Type=Service
X-KDE-ServiceTypes=KDEDModule
X-KDE-Library=notificationhelper
X-KDE-FactoryName=notificationhelper
X-KDE-DBus-ModuleName=notificationhelper
X-KDE-Kded-autoload=true
X-KDE-Kded-phase=2
X-Ubuntu-Gettext-Domain=desktop_kubuntu-notification-helper
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