i was installing ubuntu 21.04 allong side 20.04 and 18.04

[rahul_bhise]

the installation prosses just crashed

ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: ubiquity 21.04.19
ProcVersionSignature: Ubuntu 5.11.0-16.17-generic 5.11.12
Uname: Linux 5.11.0-16-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu65
Architecture: amd64
CasperMD5CheckResult: pass
CasperVersion: 1.461
Date: Sun Aug 22 21:28:49 2021
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed maybe-ubiquity ---
LiveMediaBuild: Ubuntu 21.04 "Hirsute Hippo" - Release amd64 (20210420)
RebootRequiredPkgs:
 linux-image-5.11.0-16-generic
 linux-base
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Erich Eickmeyer (eeickmeyer)]

Thank you for taking the time to report this bug and make Ubuntu better.

The following lines were found in the log files you provided:

Aug 22 15:58:10 ubuntu grub-installer: Installing for x86_64-efi platform.
Aug 22 15:58:22 ubuntu grub-installer: grub-install: warning: Internal error.
Aug 22 15:58:22 ubuntu grub-installer: grub-install: error: failed to register the EFI boot entry: Operation not permitted.
Aug 22 15:58:22 ubuntu grub-installer: error: Running 'grub-install --force --target x86_64-efi "/dev/sda"' failed.
Aug 22 15:58:35 ubuntu plugininstall.py: ubiquity.install_misc.InstallStepError: GrubInstaller failed with code 1

This means the bootloader failed to install. Redirecting bug to grub-installer accordingly.