prerm is in charon-systemd 5.6.2-1ubuntu2.
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 | #!/bin/sh
set -e
# Automatically added by dh_systemd_start/11.1.4ubuntu1
if [ -d /run/systemd/system ]; then
deb-systemd-invoke stop 'strongswan-swanctl.service' >/dev/null || true
fi
# End automatically added section
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