package grub-efi-amd64 2.02-2ubuntu8.6 failed to install/upgrade: installed grub-efi-amd64 package post-installation script subprocess returned error exit status 1

[Gene Vigelis]

Unknown why this started failing

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: grub-efi-amd64 2.02-2ubuntu8.6
ProcVersionSignature: Ubuntu 4.15.0-36.39-generic 4.15.18
Uname: Linux 4.15.0-36-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.4
Architecture: amd64
Date: Sat Oct 13 00:43:23 2018
ErrorMessage: installed grub-efi-amd64 package post-installation script subprocess returned error exit status 1
EtcDefaultGrubD.50-curtin-settings.cfg:
 GRUB_CMDLINE_LINUX_DEFAULT=""
 # disable grub os prober that might find other OS installs.
 GRUB_DISABLE_OS_PROBER=true
 GRUB_TERMINAL=console
ProcCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-36-generic root=/dev/mapper/vg--hostname-root ro
Python3Details: /usr/bin/python3.6, Python 3.6.6, python3-minimal, 3.6.5-3ubuntu1
PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu2
 apt 1.6.3ubuntu0.1
SourcePackage: grub2
Title: package grub-efi-amd64 2.02-2ubuntu8.6 failed to install/upgrade: installed grub-efi-amd64 package post-installation script subprocess returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)