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/lib/partman/finish.d/75reformat_after_restart is in ubiquity 18.04.14.

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#!/bin/sh

. /lib/partman/lib/base.sh

for dev in $DEVICES/*; do
	[ -d "$dev" ] || continue
	cd "$dev"
	open_dialog PARTITIONS
	while { read_line num id size type fs path name; [ "$id" ]; }; do
		if [ -f "$id/method" ]; then
			method=$(cat "$id/method")
			if [ "$method" = format ]; then
				echo keep >"$id/method"
			fi
		fi
		if [ -f "$id/format" ]; then
			rm -f "$id/format"
		fi
	done
	close_dialog
done