postrm is in samba 2:4.1.6+dfsg-1ubuntu2.
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  | #! /bin/sh -e
set -e
if [ "$1" = purge ]; then
	# Remove Samba's state files, both volatile and non-volatile
	rm -Rf /var/run/samba/ /var/cache/samba/ /var/lib/samba
	# Remove log files
	rm -Rf /var/log/samba/
	if [ -e /usr/share/debconf/confmodule ]; then
		. /usr/share/debconf/confmodule
		db_purge
	fi
fi
# Automatically added by dh_installdeb
dpkg-maintscript-helper rm_conffile /etc/network/if-up.d/samba 2:3.6.5-6~ samba -- "$@"
# End automatically added section
# Automatically added by dh_makeshlibs
if [ "$1" = "remove" ]; then
	ldconfig
fi
# End automatically added section
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