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/lib/partman/finish.d/70aptinstall_lvm is in ubiquity 2.18.7.

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The actual contents of the file can be viewed below.

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#! /bin/sh
set -e

if grep -q " device-mapper$" /proc/misc; then
	# Avoid warnings from lvm2 tools about open file descriptors
	export LVM_SUPPRESS_FD_WARNINGS=1

	if pvdisplay | grep -iq "physical volume ---"; then
		apt-install lvm2 || true
	fi
fi