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/lib/partman/active_partition/87delete/choices is in ubiquity 18.04.14.

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

dev=$1
id=$2
cd $dev

open_dialog GET_LABEL_TYPE
read_line label
close_dialog

# Disable on devices where there is no "real" partitioning
if [ "$label" = loop ]; then
	exit 0
fi

db_metaget partman-partitioning/text/delete description
printf "delete\t${RET}\n"