doing dual boot with windows10 but windows crashed and i did again reinstall ubantu shows grub fetal error

[vishal]

i was doing dual boot with windows 10 but windows 10 crashed and i did again reinstall ubantu shows grub fetal error

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubiquity 20.04.15.2
ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
Uname: Linux 5.4.0-42-generic x86_64
NonfreeKernelModules: wl zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu27.4
Architecture: amd64
CasperMD5CheckResult: pass
CasperVersion: 1.445.1
CurrentDesktop: ubuntu:GNOME
Date: Wed Aug 19 01:26:36 2020
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed maybe-ubiquity quiet splash ---
LiveMediaBuild: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
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)

[Seth Arnold (seth-arnold)]

Thanks for taking the time to report this bug and helping to make Ubuntu better. We appreciate the difficulties you are facing, but this appears to be a "regular" (non-security) bug. I have unmarked it as a security issue since this bug does not show evidence of allowing attackers to cross privilege boundaries nor directly cause loss of data/privacy. Please feel free to report any other bugs you may find.

[Seth Arnold (seth-arnold)]

Well this is curious:

Aug 18 19:52:48 ubuntu ubiquity: Secure Boot not enabled on this system.
Aug 18 19:52:51 ubuntu grub-installer: info: Installing grub on '/dev/sda'
Aug 18 19:52:51 ubuntu grub-installer: info: grub-install does not support --no-floppy
Aug 18 19:52:51 ubuntu grub-installer: info: Running chroot /target grub-install --force "/dev/sda"
Aug 18 19:52:52 ubuntu grub-installer: Installing for x86_64-efi platform.
Aug 18 19:53:05 ubuntu grub-installer: grub-install: warning: Internal error.
Aug 18 19:53:05 ubuntu grub-installer: grub-install: error: failed to register the EFI boot entry: Operation not permitted.
Aug 18 19:53:05 ubuntu grub-installer: error: Running 'grub-install --force "/dev/sda"' failed.

I can't recall ever seeing this error before.

Is there something funny with this machine that would prevent changing the OS or similar?

Thanks