[Bug 1892687] [NEW] grub installaion failed, then installer crashed

[Norbert]

Public bug reported:

Using Ubuntu MATE 20.10 20200824, the problem with grub returned.
On both EFI and legacy systems.

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: ubiquity 20.10.9
ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
Uname: Linux 5.4.0-42-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu44
Architecture: amd64
CasperMD5CheckResult: pass
CasperVersion: 1.452
Date: Mon Aug 24 11:17:46 2020
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu-mate.seed maybe-ubiquity quiet splash ---
LiveMediaBuild: Ubuntu-MATE 20.10 "Groovy Gorilla" - Alpha amd64 (20200824)
ProcEnviron:
 LANGUAGE=en_US.UTF-8
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 LC_NUMERIC=C.UTF-8
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug groovy ubiquity-20.10.9 ubuntu-mate

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https://bugs.launchpad.net/bugs/1892687

Title:
  grub installaion failed, then installer crashed

Status in grub-installer package in Ubuntu:
  New

Bug description:
  Using Ubuntu MATE 20.10 20200824, the problem with grub returned.
  On both EFI and legacy systems.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.10
  Package: ubiquity 20.10.9
  ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
  Uname: Linux 5.4.0-42-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu44
  Architecture: amd64
  CasperMD5CheckResult: pass
  CasperVersion: 1.452
  Date: Mon Aug 24 11:17:46 2020
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu-mate.seed maybe-ubiquity quiet splash ---
  LiveMediaBuild: Ubuntu-MATE 20.10 "Groovy Gorilla" - Alpha amd64 (20200824)
  ProcEnviron:
   LANGUAGE=en_US.UTF-8
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   LC_NUMERIC=C.UTF-8
  SourcePackage: grub-installer
  UpgradeStatus: No upgrade log present (probably fresh install)

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