This file is indexed.

postrm is in mysql-common 5.8+1.0.4.

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.

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#!/bin/sh
set -e

if [ "$1" = "purge" ]; then
  update-alternatives --remove my.cnf /etc/mysql/my.cnf.migrated
  rm -f /etc/mysql/my.cnf.migrated  # created by mysql-common from our obsolete conffile my.cnf
  rm -f /etc/mysql/my.cnf.old       # created by mariadb-common from our obsolete conffile my.cnf
  rmdir /etc/mysql 2>/dev/null || true
fi

# Automatically added by dh_installdeb/11ubuntu1
dpkg-maintscript-helper rm_conffile /etc/mysql/my.cnf 5.6.22-1~ mysql-common -- "$@"
# End automatically added section
# Automatically added by dh_installdeb/11ubuntu1
dpkg-maintscript-helper rm_conffile /etc/mysql/conf.d/.keepme 5.6.22-1~ mysql-common -- "$@"
# End automatically added section