postinst 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 | #!/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
	configure|abort-upgrade)
		update-alternatives --install /usr/bin/view view /usr/bin/mcview 25 \
			--slave /usr/share/man/man1/view.1.gz view.1.gz /usr/share/man/man1/mcview.1.gz
		update-alternatives --install /usr/bin/editor editor /usr/bin/mcedit 25 \
			--slave /usr/share/man/man1/editor.1.gz editor.1.gz /usr/share/man/man1/mcedit.1.gz
	;;
esac
# Automatically added by dh_installmenu
if [ "$1" = "configure" ] && [ -x "`which update-menus 2>/dev/null`" ]; then
	update-menus
fi
# End automatically added section
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