postrm is in setserial 2.17-49.
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.
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set -e
package="setserial"
if [ purge = "$1" ]; then
  update-rc.d setserial remove >/dev/null
  update-rc.d etc-setserial remove >/dev/null
  if [ -e /var/lib/setserial/etc.serial.conf.bkp ] ; then
      rm -f /var/lib/setserial/etc.serial.conf.bkp
  fi
  if [ -e /var/lib/setserial/autoserial.conf ] ; then
      rm -f /var/lib/setserial/autoserial.conf
  fi
  if [ -e /var/lib/setserial/autoserial.conf.old ] ; then
      rm -f /var/lib/setserial/autoserial.conf.old
  fi
fi
if [ -f /usr/share/debconf/confmodule ]; then # debconf exists
. /usr/share/debconf/confmodule
# HHH update-modules removed
# if [ -x /sbin/update-modules ]; then
#  #db_get setserial/usemodup
#  #if [ "$RET" = "true" ]; then
#   if ! /sbin/update-modules ; then
#    # cannot easily tell the user there was a problem, so silently ignore it
#    WHOCARES=0;
#   fi
#  #fi
# fi
fi
#ENDOF DEBCONF
#if [ -x /sbin/update-modules ]; then
#  mv /etc/modules.conf /etc/modules.conf.old.$package
#  if ! /sbin/update-modules ; then
#    mv /etc/modules.conf.old.$package /etc/modules.conf
#  else
#    mv /etc/modules.conf /etc/modules.conf.new.$package
#    mv /etc/modules.conf.old.$package /etc/modules.conf
#    ucf /etc/modules.conf.new.$package /etc/modules.conf
#  fi
#fi
# Automatically added by dh_systemd_enable
if [ "$1" = "remove" ]; then
	if [ -x "/usr/bin/deb-systemd-helper" ]; then
		deb-systemd-helper mask setserial.service >/dev/null
	fi
fi
if [ "$1" = "purge" ]; then
	if [ -x "/usr/bin/deb-systemd-helper" ]; then
		deb-systemd-helper purge setserial.service >/dev/null
		deb-systemd-helper unmask setserial.service >/dev/null
	fi
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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