This file is indexed.

/lib/partman/undo.d/99signal_ubiquity is in ubiquity 2.18.7.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#! /bin/sh -e

. /usr/share/debconf/confmodule

db_set ubiquity/partman-rebuild-cache ALL

exit 0