[Bug 1627584] Re: package grub-efi-amd64-signed 1.66.3+2.02~beta2-36ubuntu3.3 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Steve Langasek]

The error in your log is:

> grub-install: error: attempt to install to encrypted disk without
cryptodisk enabled. Set `GRUB_ENABLE_CRYPTODISK=1' in file
`/etc/default/grub'..

However, this is being installed for UEFI, which means the target disk
must be an EFI System Partition and can't be encrypted.  And this is an
upgrade, which means you previously had grub2-signed installed, and we
have not reduced the set of grub modules included in grub2-signed;
/neither/ the new /nor/ the old version of grub-efi-amd64-signed that
you had installed on your system has support for loading kernels from
encrypted partitions.

Did you reconfigure your system to use encryption after installation?
Did you manually install a version of grub with cryptodisk support, or
is your /boot partition not properly mounted?  Please attach /etc/fstab
and the output of 'mount' from the affected system.

** Changed in: grub2-signed (Ubuntu)
       Status: New => Incomplete

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Title:
  package grub-efi-amd64-signed 1.66.3+2.02~beta2-36ubuntu3.3 failed to
  install/upgrade: subprocess installed post-installation script
  returned error exit status 1

Status in grub2-signed package in Ubuntu:
  Incomplete

Bug description:
  i was installing an update

  ProblemType: Package
  DistroRelease: Ubuntu 16.04
  Package: grub-efi-amd64-signed 1.66.3+2.02~beta2-36ubuntu3.3
  ProcVersionSignature: Ubuntu 4.2.0-37.43-generic 4.2.8-ckt10
  Uname: Linux 4.2.0-37-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  Date: Sun Sep 25 20:55:40 2016
  ErrorMessage: subprocess installed post-installation script returned error exit status 1
  InstallationDate: Installed on 2016-04-27 (152 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  RelatedPackageVersions:
   dpkg 1.18.4ubuntu1.1
   apt  1.2.14
  SourcePackage: grub2-signed
  Title: package grub-efi-amd64-signed 1.66.3+2.02~beta2-36ubuntu3.3 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
  UpgradeStatus: Upgraded to xenial on 2016-09-26 (0 days ago)

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