postrm is in nbd-server 1:2.9.25-2ubuntu1.
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 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 | #! /bin/sh
# postrm script for nbd
#
# see: dh_installdeb(1)
set -e
if [ -f /usr/share/debconf/confmodule ]
then
  . /usr/share/debconf/confmodule
fi
# summary of how this script can be called:
#        * <postrm> `remove'
#        * <postrm> `purge'
#        * <old-postrm> `upgrade' <new-version>
#        * <new-postrm> `failed-upgrade' <old-version>
#        * <new-postrm> `abort-install'
#        * <new-postrm> `abort-install' <old-version>
#        * <new-postrm> `abort-upgrade' <old-version>
#        * <disappearer's-postrm> `disappear' <r>overwrit>r> <new-version>
# for details, see /usr/share/doc/packaging-manual/
case "$1" in
       remove|upgrade|failed-upgrade|abort-install|abort-upgrade|disappear)
        ;;
       purge)
	ucf --purge /etc/nbd-server/config || rm -f /etc/nbd-server/config
	db_purge ||:
	;;
    *)
        echo "postrm called with unknown argument \`$1'" >&2
        exit 0
esac
# dh_installdeb will replace this with shell code automatically
# generated by other debhelper scripts.
# Automatically added by dh_installinit
if [ "$1" = "purge" ] ; then
	update-rc.d nbd-server remove >/dev/null
fi
# End automatically added section
# Automatically added by dh_installdebconf
if [ "$1" = purge ] && [ -e /usr/share/debconf/confmodule ]; then
	. /usr/share/debconf/confmodule
	db_purge
fi
# End automatically added section
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