Grub 2 fails to instal so instal is usless

[Rohl Withit]

I have attempted to install Mate several times and with different settings. Every time it installs all the way to install Grub2 and then fatal error grub fails to launch.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubiquity 20.04.15.10
ProcVersionSignature: Ubuntu 5.8.0-43.49~20.04.1-generic 5.8.18
Uname: Linux 5.8.0-43-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu27.16
Architecture: amd64
CasperMD5CheckMismatches: ./pool/restricted/n/nvidia-graphics-drivers-460/nvidia-utils-460_460.32.03-0ubuntu0.20.04.1_amd64.deb
CasperMD5CheckResult: skip
CasperVersion: 1.445.1
Date: Wed Jun 26 10:02:27 2024
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu-mate.seed only-ubiquity quiet splash nomodeset ---
LiveMediaBuild: Ubuntu-MATE 20.04.2.0 LTS "Focal Fossa" - Release amd64 (20210209.1)
ProcEnviron:
 LANGUAGE=en_US.UTF-8
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 LC_NUMERIC=C.UTF-8
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)