board_inspector.py fails to run on target with clean Ubuntu installation
Python package is not in debian package, so put its installation
process in the acrn-board-inspector.postinst script
#* Copyright (c) 2020 Intel Corporation SPDX-License-Identifier: BSD-3-Clause
# postinst script for acrn-board-inspector
+pip3 install xmlschema
+
set -e
filename='/etc/default/grub'
