Bug#722449: grub-common: /etc/grub.d/ not updated, update fails with "GRUB >= 2.00 has been unpacked but not yet configured."

[Peter Gervai]

Package: grub-common
Version: 2.00-18
Severity: normal

update-grub (and package update) failed with

  GRUB >= 2.00 has been unpacked but not yet configured.
  grub-mkconfig will not work until the upgrade is complete.
  It should run later as part of configuring the new GRUB packages.

The cause seems to be that /etc/grub.d/ files were not updated. 
Removing them and reinstalling the package resulted... empty /etc/grub.d/,
so it seems the package did not quite want to overwrite anything there.

After manually moved /etc/grub.d/ from the package file update works,
the files visibly different. Possibly a purge would solve the problem but
it's not practical (I do not want to risk customised configs).

Googling it reveals this problem exists for quite a time and most people had
to purge/reinstall to resolve it.

-- Package-specific info:

-- System Information:
Debian Release: wheezy/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.8-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)
Shell: /bin/sh linked to /bin/bash

Versions of packages grub-common depends on:
ii  gettext-base        0.18.2.1-1
ii  libc6               2.17-3
ii  libdevmapper1.02.1  2:1.02.77-1
ii  libfreetype6        2.4.9-1.1
ii  libfuse2            2.9.2-4
ii  liblzma5            5.1.1alpha+20120614-2
ii  zlib1g              1:1.2.8.dfsg-1

Versions of packages grub-common recommends:
ii  os-prober  1.63

Versions of packages grub-common suggests:
ii  console-setup  1.93
ii  desktop-base   7.0.3
pn  grub-emu       <none>
pn  multiboot-doc  <none>
pn  xorriso        <none>

-- debconf-show failed