prerm is in libpam-systemd 237-3ubuntu10.
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 | #! /bin/sh
set -e
# pam-auth-update --remove removes the named profile from the active config.
# It arguably should be called during deconfigure as well, but deconfigure
# can happen in some cases during a dist-upgrade and we don't want to
# deconfigure all PAM modules in the middle of a dist-upgrade by accident.
#
# More importantly, with the current implementation, --remove also removes
# all local preferences for the named config (such as whether it's enabled
# or disabled), which we don't want to do on deconfigure.
#
# This may need to change later as pam-auth-update evolves.
if [ "$1" = remove ] && [ "${DPKG_MAINTSCRIPT_PACKAGE_REFCOUNT:-1}" = 1 ]; then
pam-auth-update --package --remove systemd
fi
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