[Bug 1887260] [NEW] During install, grub-install crashes. Attempts to install to alternative partitions also fails with fatal error

[Dennis]

Public bug reported:

Installing alongside Windows 10

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubiquity 20.04.15
ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
Uname: Linux 5.4.0-26-generic x86_64
NonfreeKernelModules: wl zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
CasperVersion: 1.445
Date: Sun Jul 12 11:18:47 2020
InstallCmdLine: file=/cdrom/preseed/ubuntu.seed initrd=/casper/initrd quiet splash --- maybe-ubiquity
LiveMediaBuild: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: grub-installer (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal ubiquity-20.04.15 ubuntu

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https://bugs.launchpad.net/bugs/1887260

Title:
  During install, grub-install crashes.  Attempts to install to
  alternative partitions also fails with fatal error

Status in grub-installer package in Ubuntu:
  New

Bug description:
  Installing alongside Windows 10

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: ubiquity 20.04.15
  ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
  Uname: Linux 5.4.0-26-generic x86_64
  NonfreeKernelModules: wl zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu27
  Architecture: amd64
  CasperMD5CheckResult: skip
  CasperVersion: 1.445
  Date: Sun Jul 12 11:18:47 2020
  InstallCmdLine: file=/cdrom/preseed/ubuntu.seed initrd=/casper/initrd quiet splash --- maybe-ubiquity
  LiveMediaBuild: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  SourcePackage: grub-installer
  UpgradeStatus: No upgrade log present (probably fresh install)

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