prerm is in congress-common 7.0.0-0ubuntu1.
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 | #!/bin/sh
set -e
if [ "${1}" = "remove" ] && [ -r /usr/share/debconf/confmodule ] && [ -r /usr/share/dbconfig-common/dpkg/prerm ] ; then
	. /usr/share/debconf/confmodule
	db_get congress/configure_db
	if [ "$RET" = "true" ]; then
		. /usr/share/dbconfig-common/dpkg/prerm
		dbc_go ${DPKG_MAINTSCRIPT_PACKAGE} $@
	fi
fi
exit 0
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