Grub installation failed

[Amitava Saha]

At the end of the Ubuntu installation I received an error message that Grub installation failed, and I am being asked to restart my system to use the new installation

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubiquity 20.04.15.17
ProcVersionSignature: Ubuntu 5.11.0-27.29~20.04.1-generic 5.11.22
Uname: Linux 5.11.0-27-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu27.18
Architecture: amd64
CasperMD5CheckMismatches: ./pool/main/g/gcc-9/libstdc++-9-dev_9.3.0-17ubuntu1~20.04_amd64.deb ./pool/main/g/grub2-signed/grub-efi-amd64-signed_1.167.2+2.04-1ubuntu44.2_amd64.deb ./pool/main/g/gcc-10/libubsan1_10.3.0-1ubuntu1~20.04_amd64.deb ./pool/restricted/n/nvidia-graphics-drivers-460/xserver-xorg-video-nvidia-460_460.91.03-0ubuntu0.20.04.1_amd64.deb
CasperMD5CheckResult: fail
CasperVersion: 1.445.1
CurrentDesktop: ubuntu:GNOME
Date: Sat Apr 23 17:34:22 2022
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed maybe-ubiquity quiet splash ---
LiveMediaBuild: Ubuntu 20.04.3 LTS "Focal Fossa" - Release amd64 (20210819)
ProcEnviron:
 LANGUAGE=en_IN
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_IN
 LC_NUMERIC=C.UTF-8
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)