Public bug reported:

Looking at linux-image-extra-3.19.0-18-generic here, but I expect this
to be pretty pervasive. This is its postrm:

#!/bin/sh
set -e

case "$0::$1" in
*.postinst::configure|*.postrm::remove)
        depmod -a -F /boot/System.map-3.19.0-18-generic 3.19.0-18-generic || 
true
        for dir in "/etc/kernel/postinst.d" 
"/etc/kernel/postinst.d/3.19.0-18-generic"
        do
                if [ -d "$dir" ]; then
                        run-parts --verbose --exit-on-error 
--arg="3.19.0-18-generic" --arg="/boot/vmlinuz-3.19.0-18-generic" "$dir"
                fi
        done
        ;;
esac

As you can see it executes /etc/kernel/postinst.d/* instead of
/etc/kernel/postrm.d/* even if it's called as a postrm script. Why? The
problem for us is that this re-executes dkms's autoinstaller, which
recompiles certain modules even if the kernel is being removed. But I
find this behavior pretty surprising regardless of this.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1475662

Title:
  Kernel postrm calls /etc/kernel/postinst.d/*

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