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/lib/partman/active_partition/10change_name/choices is in ubiquity 18.04.14.

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#!/bin/sh

. /lib/partman/lib/base.sh

dev=$1
id=$2
cd $dev

open_dialog  USES_NAMES
read_line x
close_dialog

if [ "$x" = yes ]; then
	open_dialog PARTITION_INFO $id
	read_line x1 id x3 x4 x5 x6 old_name
	close_dialog
	db_metaget partman-partitioning/text/set_name description
	printf "setname\t%s\${!TAB}%s\n" "${RET}" "$old_name"
fi