postrm is in xemacs21-mule-canna-wnn 21.4.22-3.2ubuntu1.
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 | #!/bin/sh
set -e
# 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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