postinst is in squid3 3.5.12-1ubuntu7.
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 | #! /bin/sh
set -e
# dh_installdeb will replace this with shell code automatically
# generated by other debhelper scripts.
update-rc.d squid3 remove >/dev/null
rm -f "/etc/apparmor.d/disable/usr.sbin.squid3" || true
rm -f "/etc/apparmor.d/force-complain/usr.sbin.squid3" || true
rm -f "/etc/apparmor.d/local/usr.sbin.squid3" || true
exit 0
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