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/lib/partman/finish.d/70aptinstall_xfs is in ubiquity 2.10.16.

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

. /lib/partman/lib/base.sh

xfs=no

for dev in $DEVICES/*; do
	[ -d "$dev" ] || continue
	cd $dev
	partitions=
	open_dialog PARTITIONS
	while { read_line num id size type fs path name; [ "$id" ]; }; do
		[ "$fs" != free ] || continue
		[ -f $id/method -a -f $id/acting_filesystem ] || continue
		filesystem=$(cat $id/acting_filesystem)
		case $filesystem in
		    xfs)
			xfs=yes
			;;
		esac
	done
	close_dialog
done

if [ "$xfs" = yes ]; then
	apt-install xfsprogs || true
fi