postinst is in systemd-coredump 229-4ubuntu4.
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 | #!/bin/sh
set -e
if [ "$1" = configure ]; then
adduser --quiet --system --group --no-create-home --home /run/systemd \
--gecos "systemd core dump processing" systemd-coredump
# enable systemd-coredump right after package installation
if [ -d /run/systemd/system ]; then
systemctl start systemd-coredump.socket || true
fi
/lib/systemd/systemd-sysctl /usr/lib/sysctl.d/50-coredump.conf || true
fi
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