/usr/share/app-install/desktop/wakeup:wakeup.desktop is in app-install-data 0.12.04.4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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X-AppInstall-Package=wakeup
X-AppInstall-Popcon=132
X-AppInstall-Section=universe
Name=Wakeup
Exec=wakeup-settings
Icon=appointment-new
Type=Application
Categories=GNOME;GTK;Utility;
Comment=A talking and fully customizable alarm clock that will operate from poweroff
X-AppInstall-Package=wakeup
X-AppInstall-Popcon=132
X-Ubuntu-Gettext-Domain=app-install-data
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