/usr/share/apport/package-hooks/unity-2d.py is in unity-2d-common 5.12.0-0ubuntu1.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | def add_info(report):
report['Tags'] = report.get('Tags', '') + ' unity-2d'
|