postinst is in lm-sensors 1:3.3.1-2ubuntu1.
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 20 21 22 23 24 25 26 27 | #!/bin/sh
# postinst script for sensord
#
# see: dh_installdeb(1)
set -e
case "$1" in
    configure)
        # Remove shutdown and reboot links; this init script does not need them.
        if dpkg --compare-versions "$2" lt "1:3.0.2-2"; then
	    rm -f /etc/rc0.d/K[0-9][0-9]sensord /etc/rc6.d/K[0-9][0-9]sensord
        fi
    ;;
    abort-upgrade|abort-remove|abort-deconfigure)
    ;;
    *)
        echo "postinst called with unknown argument \`$1'" >&2
	exit 1
    ;;
esac
# Automatically added by dh_installinit
if [ -x "/etc/init.d/lm-sensors" ]; then
	update-rc.d lm-sensors start 47 S . >/dev/null || exit $?
fi
# End automatically added section
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