[Bug 1942803] Re: grub-install failed during reinstall

[Malachi de AElfweald]

** Attachment added: "These are the auto-generated partitions"
   https://bugs.launchpad.net/ubuntu/+source/grub-installer/+bug/1942803/+attachment/5523321/+files/disks.png

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https://bugs.launchpad.net/bugs/1942803

Title:
  grub-install failed during reinstall

Status in grub-installer package in Ubuntu:
  New

Bug description:
  This machine was previously running 18.04. I decided to replace it
  with 21.04 (using the ISO via USB) rather than doing an in-place
  upgrade.

  The Ubiquiti installer gets to the grub-install step then fails with:
  ```
  Executing grub-install /dev/nvme2n1 failed
  This is a fatal error
  ```

  TBH I would have expected that it should have been something like
  /dev/nvme2n1p1 since that was the vfat partition it created.

  I tried enabling the same kernel configuration I used to finally get
  18.04 to install a couple years ago, but with the same end result.

  ProblemType: Bug
  DistroRelease: Ubuntu 21.04
  Package: ubiquity 21.04.19
  ProcVersionSignature: Ubuntu 5.11.0-16.17-generic 5.11.12
  Uname: Linux 5.11.0-16-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu65.1
  Architecture: amd64
  CasperMD5CheckResult: pass
  CasperVersion: 1.461
  Date: Mon Sep  6 15:21:02 2021
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed maybe-ubiquity reboot=pci pcie_aspm=off memory_corruption_check=0 nowatchdog nomodeset nohalt acpi=off nvme_core.default_ps_max_latency_us=0 ---
  LiveMediaBuild: Ubuntu 21.04 "Hirsute Hippo" - Release amd64 (20210420)
  SourcePackage: grub-installer
  UpgradeStatus: No upgrade log present (probably fresh install)

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