postrm is in mythbuntu-control-centre 0.63-0ubuntu2.
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 | #! /bin/sh
set -e
case "$1" in
remove|purge|upgrade)
if dpkg-divert --list mythbuntu-control-centre | grep diverted >/dev/null; then
dpkg-divert --package mythbuntu-control-centre --remove \
--rename --divert /usr/share/mythtv/main_settings.xml.diverted /usr/share/mythtv/main_settings.xml
fi
;;
esac
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