[Bug 1922547] [NEW] Fatal Grub Error when installing Ubuntu from the latest iso

[rue]

Public bug reported:

Just down loaded the latest daily ISO for Ubuntu, It boots into the live desktop okay. 
I run through the installer fine, when it gets to the end of the installation it gives me a fatal Grub error then completes the install with the Continue testing or Restart box

ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: ubiquity 21.04.13
ProcVersionSignature: Ubuntu 5.11.0-13.14-generic 5.11.7
Uname: Linux 5.11.0-13-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu61
Architecture: amd64
CasperMD5CheckResult: pass
CasperVersion: 1.461
Date: Mon Apr  5 21:55:33 2021
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed maybe-ubiquity quiet splash ---
LiveMediaBuild: Ubuntu 21.04 "Hirsute Hippo" - Beta amd64 (20210404)
RebootRequiredPkgs:
 linux-image-5.11.0-13-generic
 linux-base
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug hirsute ubiquity-21.04.13 ubuntu

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https://bugs.launchpad.net/bugs/1922547

Title:
  Fatal Grub Error when installing Ubuntu from the latest iso

Status in ubiquity package in Ubuntu:
  New

Bug description:
  Just down loaded the latest daily ISO for Ubuntu, It boots into the live desktop okay. 
  I run through the installer fine, when it gets to the end of the installation it gives me a fatal Grub error then completes the install with the Continue testing or Restart box

  ProblemType: Bug
  DistroRelease: Ubuntu 21.04
  Package: ubiquity 21.04.13
  ProcVersionSignature: Ubuntu 5.11.0-13.14-generic 5.11.7
  Uname: Linux 5.11.0-13-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu61
  Architecture: amd64
  CasperMD5CheckResult: pass
  CasperVersion: 1.461
  Date: Mon Apr  5 21:55:33 2021
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed maybe-ubiquity quiet splash ---
  LiveMediaBuild: Ubuntu 21.04 "Hirsute Hippo" - Beta amd64 (20210404)
  RebootRequiredPkgs:
   linux-image-5.11.0-13-generic
   linux-base
  SourcePackage: ubiquity
  UpgradeStatus: No upgrade log present (probably fresh install)

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