package grub-efi-amd64-signed 1.66.22+2.02~beta2-36ubuntu3.22 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Thomas Crellen]

Tried to update from Ubuntu 12.04 to 16.04 using a download on a USB stick and ran into errors. Then tried to upgrade the partial installation of 16.04 to 18.04 and ran into further errors.

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: grub-efi-amd64-signed 1.66.22+2.02~beta2-36ubuntu3.22
ProcVersionSignature: Ubuntu 4.15.0-58.64~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-58-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.19
Architecture: amd64
Date: Thu Aug 15 23:18:18 2019
DuplicateSignature:
 package:grub-efi-amd64-signed:1.66.22+2.02~beta2-36ubuntu3.22
 Setting up grub-efi-amd64-signed (1.66.22+2.02~beta2-36ubuntu3.22) ...
 grub-install: error: /usr/lib/grub/i386-pc/modinfo.sh doesn't exist. Please specify --target or --directory.
 dpkg: error processing package grub-efi-amd64-signed (--configure):
  subprocess installed post-installation script returned error exit status 1
ErrorMessage: subprocess installed post-installation script returned error exit status 1
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.6
 apt 1.2.32
SourcePackage: grub2-signed
Title: package grub-efi-amd64-signed 1.66.22+2.02~beta2-36ubuntu3.22 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: Upgraded to xenial on 2019-08-15 (0 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.