postinst is in bosixnet-webui 1.7-1.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19  | #!/bin/sh
set -e
id -u bosixnet >/dev/null 2>&1 || adduser --quiet \
                                          --system \
                                          --group \
                                          --no-create-home \
                                          --home /nonexistent \
                                          bosixnet
# Automatically added by dh_installinit
if [ -x "/etc/init.d/bosixnet-webui" ]; then
	update-rc.d bosixnet-webui defaults >/dev/null
fi
if [ -x "/etc/init.d/bosixnet-webui" ] || [ -e "/etc/init/bosixnet-webui.conf" ]; then
	invoke-rc.d bosixnet-webui start || exit $?
fi
# End automatically added section
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