postrm is in libpion-net-4.0 4.0.7+dfsg-3.1ubuntu2.
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 | #!/bin/sh
set -e
# Automatically added by dh_makeshlibs
if [ "$1" = "remove" ]; then
ldconfig
fi
# End automatically added section
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