postrm is in mc 3:4.8.11-1.
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 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 | #!/bin/sh
set -e
dpkg-maintscript-helper rm_conffile /etc/mc/edit.spell.rc  3:4.8.5-1 -- "$@"
dpkg-maintscript-helper rm_conffile /etc/mc/mc.charsets  3:4.8-1 -- "$@"
dpkg-maintscript-helper rm_conffile /etc/mc/mc.lib       3:4.8-1 -- "$@"
dpkg-maintscript-helper rm_conffile /etc/mc/Syntax       3:4.8-1 -- "$@"
dpkg-maintscript-helper mv_conffile \
		/etc/mc/cedit.menu    /etc/mc/mcedit.menu        3:4.8-1 -- "$@"
dpkg-maintscript-helper mv_conffile \
	/etc/mc/mc.keymap.emacs    /etc/mc/mc.emacs.keymap       3:4.8.8-0 -- "$@"
dpkg-maintscript-helper mv_conffile \
	/etc/mc/mc.keymap.default  /etc/mc/mc.default.keymap     3:4.8.8-0 -- "$@"
case "$1" in
	purge)
		rm -f \
			/etc/mc/cedit.menu \
			/etc/mc/*.ini \
			/etc/mc/mc.* \
			/etc/mc/*.rc \
			/etc/mc/Syntax
		rmdir /etc/mc 2>/dev/null || true
	;;
esac
# Automatically added by dh_installmenu
if [ -x "`which update-menus 2>/dev/null`" ]; then update-menus ; fi
# End automatically added section
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