postrm is in lsb-release 4.0-0ubuntu20.
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 | #!/bin/sh -e
case "$1" in
purge)
if [ -e /etc/lsb-release ]; then
MD5SUM=`md5sum /etc/lsb-release | cut -d" " -f1`
if [ "$MD5SUM" = "b5bfe10d9b02fb4e4a45337d1c4d88ab" ]; then
rm -f /etc/lsb-release
fi
fi
;;
esac
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