[Bug 1899757] Re: package grub-pc 2.04-1ubuntu26.4 failed to install/upgrade: installed grub-pc package post-installation script subprocess returned error exit status 1

[Julian Andres Klode]

*** This bug is a duplicate of bug 1896608 ***
    https://bugs.launchpad.net/bugs/1896608

** This bug is no longer a duplicate of bug 1899736
   package grub-pc 2.04-1ubuntu26.4 failed to install/upgrade: installed grub-pc package post-installation script subprocess returned error exit status 1: dependency problem
** This bug has been marked a duplicate of bug 1896608
   [regression-in-stable] grub-multi-install fails with exit 1 when question grub-efi/install_devices_empty is skipped

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Title:
  package grub-pc 2.04-1ubuntu26.4 failed to install/upgrade: installed
  grub-pc package post-installation script subprocess returned error
  exit status 1

Status in grub2 package in Ubuntu:
  New

Bug description:
  无法安装“grub-pc”

  升级将继续进行，但“grub-pc”可能没有工作。请考虑提交关于它的错误报告。

  installed grub-pc package post-installation script subprocess returned
  error exit status 1

  无法安装升级

  更新已取消。您的系统可能处在不稳定状态。正在恢复 (dpkg --configure -a)。

  ProblemType: Package
  DistroRelease: Ubuntu 20.04
  Package: grub-pc 2.04-1ubuntu26.4
  ProcVersionSignature: Ubuntu 5.4.0-51.56-generic 5.4.65
  Uname: Linux 5.4.0-51-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.9
  Architecture: amd64
  CasperMD5CheckResult: skip
  Date: Wed Oct 14 12:40:50 2020
  DuplicateSignature:
   package:grub-pc:2.04-1ubuntu26.4
   Setting up grub-pc (2.04-1ubuntu26.4) ...
   dpkg: error processing package grub-pc (--configure):
    installed grub-pc package post-installation script subprocess returned error exit status 1
  ErrorMessage: installed grub-pc package post-installation script subprocess returned error exit status 1
  InstallationDate: Installed on 2015-12-17 (1763 days ago)
  InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
  ProcCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-51-generic root=UUID=8a566286-ef18-44fb-9f57-0e633bdc88e0 ro quiet splash vt.handoff=7
  Python3Details: /usr/bin/python3.8, Python 3.8.5, python3-minimal, 3.8.2-0ubuntu2
  PythonDetails: /usr/bin/python2.7, Python 2.7.18, python-is-python2, 2.7.17-4
  RelatedPackageVersions:
   dpkg 1.19.7ubuntu3
   apt  2.0.2ubuntu0.1
  SourcePackage: grub2
  Title: package grub-pc 2.04-1ubuntu26.4 failed to install/upgrade: installed grub-pc package post-installation script subprocess returned error exit status 1
  UpgradeStatus: Upgraded to focal on 2020-10-14 (0 days ago)

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