[Bug 347532] Re: [jaunty] package grub-pc 1.96+20080724-12ubuntu2 failed to install/upgrade: sub-process pre-removal script returned 10

[Stefan]

Just had exactly that problem on a 18.04 installation at the end.
It was a EFI installation and grub wanted to remove "grub-pc".

As described above, the prerm script tried to db_get the variable 
    
    grub-pc/chainload_from_menu.lst.

grub-pc version is the latest from bionic-update (2.04-1ubuntu35.2).

-- prerm ------

  #!/bin/bash
  set -e

  case "$1" in
    remove|deconfigure)
      . /usr/share/debconf/confmodule
      db_get grub-pc/chainload_from_menu.lst          <---- here the scripts aborts
      if $RET && test -e /boot/grub/menu.lst ; then
  ...

---------------

Because of "set -e", the scripts aborts when the variable is not
available.

Looking into grub-pc's config script, i find this:

  db_input high grub-pc/chainload_from_menu.lst || true

Maybe this would be a good improvement for the prerm script?

The only workaround I think of, is to preseed that variable, hoping it
doesn't harm anything.

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Title:
  [jaunty] package grub-pc 1.96+20080724-12ubuntu2 failed to
  install/upgrade: sub-process pre-removal script returned 10

Status in grub2 package in Ubuntu:
  Invalid

Bug description:
  Binary package hint: grub2

  I had neither menu.lst nor grub.cfg anywhere on my traditional-styls ext2 boot partition.
  Wanted to check out grub2, could not change kernel lines in menu.lst or grub.cfg, wanted to switch back to grub.
  On next alternate install will use traditional grub.... given, there will be the option to select it on the mini.iso...

  ProblemType: Package
  Architecture: amd64
  DistroRelease: Ubuntu 9.04
  ErrorMessage: Unterprozess pre-removal script gab den Fehlerwert 10 zurück
  NonfreeKernelModules: nvidia
  Package: grub-pc 1.96+20080724-12ubuntu2
  SourcePackage: grub2
  Title: package grub-pc 1.96+20080724-12ubuntu2 failed to install/upgrade: Unterprozess pre-removal script gab den Fehlerwert 10 zurück
  Uname: Linux 2.6.28-11-generic x86_64

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