[Bug 1901327] [NEW] GRUB installation fails at the end on /dev/sda in fresh install (erase old /)

[Benoît Rouits]

Public bug reported:

I had a Previous upgraded Ubuntu and for some reason, I decided to
install a fresh one, getting /home (/dev/sdb1) non formatted and /
(/dev/sda1) reformatted byt the partition manager at install time. At
the end of installation, grub install fails on /dev/sda (popup) and I'm
asked to restart anyway. I didn't, to be able to filling this bug. Now I
will restart and try to figure out how to fix it.

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: Sat Oct 24 18:01:13 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
 linux-base
 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

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https://bugs.launchpad.net/bugs/1901327

Title:
  GRUB installation fails at the end on /dev/sda in fresh install (erase
  old /)

Status in ubiquity package in Ubuntu:
  New

Bug description:
  I had a Previous upgraded Ubuntu and for some reason, I decided to
  install a fresh one, getting /home (/dev/sdb1) non formatted and /
  (/dev/sda1) reformatted byt the partition manager at install time. At
  the end of installation, grub install fails on /dev/sda (popup) and
  I'm asked to restart anyway. I didn't, to be able to filling this bug.
  Now I will restart and try to figure out how to fix it.

  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: Sat Oct 24 18:01:13 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
   linux-base
   linux-base
  SourcePackage: ubiquity
  UpgradeStatus: No upgrade log present (probably fresh install)

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