postinst is in quantum-common 2012.1-0ubuntu4.
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" = "configure" ]
then
if ! getent group quantum > /dev/null 2>&1
then
addgroup --system quantum >/dev/null
fi
if ! getent passwd quantum > /dev/null 2>&1
then
adduser --system --home /var/lib/quantum --ingroup quantum --no-create-home --shell /bin/false quantum
fi
chown -R quantum:quantum /var/lib/quantum/ /var/log/quantum/ /etc/quantum/
chmod 0700 /etc/quantum/ /var/log/quantum/
fi
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