This file is indexed.

/lib/partman/finish.d/20mount_partitions 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

. /lib/partman/lib/base.sh

fstab=$(
	for i in /lib/partman/fstab.d/*; do
		[ -x "$i" ] || continue
		$i
	done |
	while read fs mp type options dump pass; do
		echo $mp $fs $type $options $dump $pass
	done |
	sort |
	while read mp fs type options dump pass; do
		newoptions=
		while [ "$options" ]; do
			case $options in
			    (ro,*)
				options="${options#ro,}"
				;;
			    (ro)
				options=
				;;
			    (*,*)
				newoptions="${newoptions:+$newoptions,}${options%%,*}"
				options="${options#*,}"
				;;
			    (*)
				newoptions="${newoptions:+$newoptions,}$options"
				options=
				;;
			esac
		done
		if [ -z "$newoptions" ]; then
			newoptions=defaults
		fi
		echo $fs $mp $type $newoptions $dump $pass
	done
)

IFS="$NL"
for f in $fstab; do
	restore_ifs
	set -- $f
	case "$2" in
	    /media/*)
		mkdir -p "/target$2"
		continue
		;;
	    /*)
		mkdir -p "/target$2"
		;;
	esac
	for m in /lib/partman/mount.d/*; do
		[ -x "$m" ] || continue

		# partman-doc specifies that mount.d scripts output the command
		# needed to unmount the partition; currently this is unused
		unmount_cmd=$($m "$f")
		if [ "$?" = 0 ]; then
			continue 2
		fi
	done

	db_subst partman-target/mount_failed DEVICE $(humandev $1)
	db_subst partman-target/mount_failed MOUNTPOINT $2
	db_subst partman-target/mount_failed TYPE $3
	db_input critical partman-target/mount_failed || true
	db_go || exit 1
	db_get partman-target/mount_failed
	if [ "$RET" = true ]; then
		exit 1
	else
		exit 2
	fi
done