[Bug 1871963] Re: dpkg fails to install grub-efi-amd64 signed and shim-signed

[Ben Simpson]

I am seeing this and I suspect it is because I installed Windows on an
extra SSD that was a Linux partition. /dev/sda is that device

```
Setting up grub-efi-amd64-signed (1.155.1+2.04-1ubuntu35.1) ...
NTFS signature is missing.
Failed to mount '/dev/sda1': Invalid argument
The device '/dev/sda1' doesn't seem to have a valid NTFS.
Maybe the wrong device is used? Or the whole disk instead of a
partition (e.g. /dev/sda, not /dev/sda1)? Or the other way around?
dpkg: error processing package grub-efi-amd64-signed (--configure):
 installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 12
```

I haven't tried purging the grub package because of the high risk. This
seems to be a stale reference to the partition on what used to be a
different OS.

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https://bugs.launchpad.net/bugs/1871963

Title:
  dpkg fails to install grub-efi-amd64 signed and shim-signed

Status in dpkg package in Ubuntu:
  Invalid
Status in grub2-signed package in Ubuntu:
  Fix Released

Bug description:
  See above

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: dpkg 1.19.7ubuntu3
  ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
  Uname: Linux 5.4.0-21-generic x86_64
  ApportVersion: 2.20.11-0ubuntu26
  Architecture: amd64
  CasperMD5CheckResult: skip
  Date: Thu Apr  9 18:41:33 2020
  InstallationDate: Installed on 2020-04-09 (0 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200402)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: dpkg
  UpgradeStatus: No upgrade log present (probably fresh install)

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