error: Running 'grub-install --force --target x86_64-efi "/dev/sda"' failed.

[Jeremie Tamburini]

Ubiquity 21.04.19 installed via apt on a previous iso daily-build as an iso with 21.04.19 at the moment is not available.

DESCRIPTION:

- Partition table: msdos (MBR)
- /dev/sda1 with Ubuntu already installed
- /dev/sda2 and /dev/sda3 both Ext4

Installation modality: Install Ubuntu 21.04 alongside...

As 3 primary partition are already used, the installer is forced to use the remaining space creating an extended partition with logical partition inside:

- /dev/sda5 ESP (EFI)
- /dev/sda6 Ext4 for Ubuntu

EFI partition should be primary, not logical and as expected a popup:
  Executing 'grub-install /dev/sda' failed
  This is a fatal error

Despite this the system get installed and it is bootable.
Probably because of the recent changes on Ubiquity package.

Anyway, the 'grub error' message can be tricky!

ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: ubiquity 21.04.19
ProcVersionSignature: Ubuntu 5.11.0-14.15-generic 5.11.12
Uname: Linux 5.11.0-14-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu65
Architecture: amd64
CasperMD5CheckResult: pass
CasperVersion: 1.461
Date: Tue Apr 20 06:42:08 2021
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed maybe-ubiquity quiet splash ---
LiveMediaBuild: Ubuntu 21.04 "Hirsute Hippo" - Beta amd64 (20210416)
RebootRequiredPkgs:
 linux-image-5.11.0-16-generic
 linux-base
 linux-image-5.11.0-14-generic
 linux-base
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Sebastien Bacher (seb128)]

According to the log an error it's trying to install the efi on /dev/sda which sounds wrong. Did you do an automatic partioning?

[Jeremie Tamburini (jeremie2)]

@seb128
Yes correct, it was automatic partitioning.
I've chosen the "Install Ubuntu alongside.." option: https://postimg.cc/N2hnmtxR