Ubuntu 20.10 grub install fail on Dell R900 with single SSD

I am using a Dell R900 as a test server with quad CPU configuration and 112GB Ram.
I have been unable to install Ubuntu 20.10 onto it and have removed everything from the server, down to the base hardware.
There is now only a single SSD in the first drive slot, connected to the Dell Perc 6, non raid.
I have tried all options and configurations with the disk configuration in the installer.

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: ubiquity 20.10.13
ProcVersionSignature: Ubuntu 5.8.0-25.26-generic 5.8.14
Uname: Linux 5.8.0-25-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu50
Architecture: amd64
CasperMD5CheckResult: skip
CasperVersion: 1.455
CurrentDesktop: ubuntu:GNOME
Date: Sat Feb 6 11:08:04 2021
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed maybe-ubiquity quiet splash ---
LiveMediaBuild: Ubuntu 20.10 "Groovy Gorilla" - Release amd64 (20201022)
ProcEnviron:
 LANGUAGE=en_GB.UTF-8
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_GB.UTF-8
 LC_NUMERIC=C.UTF-8
RebootRequiredPkgs:
 linux-image-5.8.0-25-generic
 linux-base
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)