install 20.04 fails at grub loader

[aeischeid]

tried multiple times to erase disk and install, but fails each time near the end of the process. tried going back to a 19.10 and that failed too, so suspect the HDD is messed up somehow at this point, but not clear how so.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubiquity 20.04.9
ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
Uname: Linux 5.4.0-21-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu22
Architecture: amd64
CasperVersion: 1.442
Date: Tue Apr 14 11:58:16 2020
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed quiet splash ---
LiveMediaBuild: Ubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200402)
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)