postrm is in bridge-utils 1.5-2ubuntu6.
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 | #!/bin/sh
set -e
dpkg-maintscript-helper rm_conffile /etc/init/bridge-network-interface.conf \
1.4-5ubuntu2 -- "$@"
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