[Bug 1881746] [NEW] IMac 2012 machine. Installing U20.04LTS alongside U18.04 - grub2 failed to install and stated U20.04 will not load ant next boot

[Peter Clarke]

Public bug reported:

auto reports have been generated for  
iMac 2012 machine. Installing U20.04LTS alongside U18.04 - grub2 failed to install and stated U20.04 will not load at next boot

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: pass
CasperVersion: 1.445
Date: Tue Jun  2 12:43:01 2020
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed maybe-ubiquity quiet splash ---
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/1881746

Title:
  IMac 2012 machine. Installing U20.04LTS alongside U18.04 - grub2
  failed to install and stated U20.04 will not load ant next boot

Status in grub-installer package in Ubuntu:
  New

Bug description:
  auto reports have been generated for  
  iMac 2012 machine. Installing U20.04LTS alongside U18.04 - grub2 failed to install and stated U20.04 will not load at next boot

  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: pass
  CasperVersion: 1.445
  Date: Tue Jun  2 12:43:01 2020
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed maybe-ubiquity quiet splash ---
  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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