[Bug 1797807] Re: 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

[Mate Kukri]

*** This bug is a duplicate of bug 2069726 ***
    https://bugs.launchpad.net/bugs/2069726

** This bug has been marked a duplicate of bug 2069726
   outdated grub2 install failure catch-all

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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

Status in grub2 package in Ubuntu:
  New

Bug description:
  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)

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