Focal Kubuntu fails to install loading grub

[xanadu1977]

Apr 22 22:47:14 kubuntu grub-installer: info: Installing grub on '/dev/nvme0n1'
Apr 22 22:47:14 kubuntu grub-installer: info: grub-install does not support --no-floppy
Apr 22 22:47:14 kubuntu grub-installer: info: Running chroot /target grub-install --force "/dev/nvme0n1"
Apr 22 22:47:14 kubuntu grub-installer: Installing for x86_64-efi platform.
Apr 22 22:47:15 kubuntu grub-installer: grub-install: warning: Cannot set EFI variable Boot0000.
Apr 22 22:47:15 kubuntu grub-installer: grub-install: warning: efivarfs_set_variable: writing to fd 8 failed: Invalid argument.
Apr 22 22:47:15 kubuntu grub-installer: grub-install: warning: _efi_set_variable_mode: ops->set_variable() failed: Invalid argument.
Apr 22 22:47:15 kubuntu grub-installer: grub-install: error: failed to register the EFI boot entry: Invalid argument.
Apr 22 22:47:15 kubuntu grub-installer: error: Running 'grub-install --force "/dev/nvme0n1"' failed.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubiquity 20.04.15 [modified: lib/partman/automatically_partition/question]
ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
Uname: Linux 5.4.0-26-generic x86_64
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: pass
CasperVersion: 1.445
CurrentDesktop: KDE
Date: Wed Apr 22 18:48:15 2020
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/kubuntu.seed maybe-ubiquity quiet splash nomodeset ---
LiveMediaBuild: Kubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200422)
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)