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/lib/partman/choose_method/70dont_use/do_option is in ubiquity 18.04.14.

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The actual contents of the file can be viewed below.

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#!/bin/sh

. /lib/partman/lib/base.sh

dev=$2
id=$3

cd $dev

rm -f $id/method
rm -f $id/format
rm -f $id/use_filesystem

changed=''
flags=''
open_dialog GET_FLAGS $id
while { read_line flag; [ "$flag" ]; }; do
	case $flag in
	    lvm|raid|swap)
		changed=1
		continue
		;;
	    *)
		flags="${flags:+$flags$NL}$flag"
		;;
	esac
done
close_dialog

if [ "$changed" ]; then
	open_dialog SET_FLAGS $id
	write_line "$flags"
	write_line NO_MORE
	close_dialog
fi

exit 0