/usr/share/app-install/desktop/calibre:calibre.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.
1 2 3 4 5 6 7 8 9 10 11 12 13 | [Desktop Entry]
X-AppInstall-Package=calibre
X-AppInstall-Popcon=3594
X-AppInstall-Section=universe
Type=Application
Name=calibre
Comment=E-book library management
Exec=calibre
Icon=calibre
Categories=Office;Database;FileTools;Viewer;Qt;
X-Ubuntu-Gettext-Domain=app-install-data
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