Bug#966575: How to fix LLVM/LUKS installs?

[Dorian Gaensslen]

I.d.k. if it helps:

We had problems on many Systems (all of them used noninteractive 
installation method)
We saw, that if we do debconf-show grub-pc it showed us a wrong device:
  grub2/update_nvram: true
   grub-pc/install_devices_failed: false
   grub2/force_efi_extra_removable: false
 * grub2/linux_cmdline: debian-installer=en_US
   grub-pc/kopt_extracted: false
 * grub2/linux_cmdline_default: quiet
   grub-pc/install_devices_disks_changed:
   grub2/kfreebsd_cmdline:
   grub-pc/install_devices_failed_upgrade: true
   grub2/kfreebsd_cmdline_default: quiet
   grub-pc/mixed_legacy_and_grub2: true
   grub-pc/hidden_timeout: false
 * grub-pc/install_devices: /dev/vda
   grub-pc/install_devices_empty: false
   grub-pc/partition_description:
   grub-pc/postrm_purge_boot_grub: false
   grub-pc/disk_description:
   grub-pc/timeout: 5
   grub-pc/chainload_from_menu.lst: true

* should be /dev/xvda

if we start the installer manually (interactive) the output is like this

* grub-pc/install_devices_disks_changed: /dev/xvda
  grub2/kfreebsd_cmdline:
   grub-pc/mixed_legacy_and_grub2: true
   grub-pc/kopt_extracted: false
   grub-pc/hidden_timeout: false
   grub-pc/partition_description:
   grub2/kfreebsd_cmdline_default: quiet
   grub-pc/timeout: 5
 * grub2/linux_cmdline: debian-installer=en_US apparmor=1 
security=apparmor
   grub-pc/disk_description:
   grub-pc/install_devices_empty: false
 * grub-pc/install_devices: /dev/xvda
   grub-pc/chainload_from_menu.lst: true
   grub2/force_efi_extra_removable: false
   grub-pc/postrm_purge_boot_grub: false
   grub-pc/install_devices_failed_upgrade: true
 * grub2/linux_cmdline_default: quiet
   grub2/update_nvram: true
   grub-pc/install_devices_failed: false


with the last output the system worked flawlessly

strangely we had no problems whatsoever with systems which where major 
upgraded to buster.

All the Best
Dorian

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