[Bug 1908304] [NEW] grub-install failed fatal error when installing Ubuntu 20.10

[Nicolas T]

Public bug reported:

1) Ubuntu release: 20.10
2) Package version: unknown (not available from ubiquity installer)
3) Expected : successful install. The default partition option to install Ubuntu besides Windows was chosen - single drive with 3 Windows partitions (Recovery, System Reserved and main C partition) and ample unallocated space left for Ubuntu.
4) What happened: following error "L'exécution de grub-install /dev/sda a échoué. Cette erreur est fatale" (rough translation: "Running grub-install /dev/sda failed. This is a fatal error").

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: ubiquity 20.10.13
ProcVersionSignature: Ubuntu 5.8.0-25.26-generic 5.8.14
Uname: Linux 5.8.0-25-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu50
Architecture: amd64
CasperMD5CheckResult: pass
CasperVersion: 1.455
CurrentDesktop: ubuntu:GNOME
Date: Tue Dec 15 21:42:41 2020
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed maybe-ubiquity quiet splash ---
LiveMediaBuild: Ubuntu 20.10 "Groovy Gorilla" - Release amd64 (20201022)
ProcEnviron:
 LANGUAGE=fr_FR.UTF-8
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fr_FR.UTF-8
 LC_NUMERIC=C.UTF-8
RebootRequiredPkgs:
 linux-image-5.8.0-25-generic
 linux-base
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: ubiquity (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug groovy ubiquity-20.10.13 ubuntu

** Attachment added: "partman"
   https://bugs.launchpad.net/bugs/1908304/+attachment/5443922/+files/partman

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https://bugs.launchpad.net/bugs/1908304

Title:
  grub-install failed fatal error when installing Ubuntu 20.10

Status in ubiquity package in Ubuntu:
  New

Bug description:
  1) Ubuntu release: 20.10
  2) Package version: unknown (not available from ubiquity installer)
  3) Expected : successful install. The default partition option to install Ubuntu besides Windows was chosen - single drive with 3 Windows partitions (Recovery, System Reserved and main C partition) and ample unallocated space left for Ubuntu.
  4) What happened: following error "L'exécution de grub-install /dev/sda a échoué. Cette erreur est fatale" (rough translation: "Running grub-install /dev/sda failed. This is a fatal error").

  ProblemType: Bug
  DistroRelease: Ubuntu 20.10
  Package: ubiquity 20.10.13
  ProcVersionSignature: Ubuntu 5.8.0-25.26-generic 5.8.14
  Uname: Linux 5.8.0-25-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu50
  Architecture: amd64
  CasperMD5CheckResult: pass
  CasperVersion: 1.455
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Dec 15 21:42:41 2020
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed maybe-ubiquity quiet splash ---
  LiveMediaBuild: Ubuntu 20.10 "Groovy Gorilla" - Release amd64 (20201022)
  ProcEnviron:
   LANGUAGE=fr_FR.UTF-8
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=fr_FR.UTF-8
   LC_NUMERIC=C.UTF-8
  RebootRequiredPkgs:
   linux-image-5.8.0-25-generic
   linux-base
  SourcePackage: ubiquity
  UpgradeStatus: No upgrade log present (probably fresh install)

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