Atempted to install UBUNTU 20.04 with windows 10 three times. It always stops 3/4 of the way.

[Rich Case]

11/30/20

PROBLEM: attempted to install ubuntu 20.04 with windows 10. stops 3/4 of the way through.
          I think the problem is the partitioning of the drive, or the fact that I am using a
          gaming computer. I had ben running only UBUNTU on this computer for over a year.

Computer: MSI X470, AMD® Ryzen 5 1600 six-core processor, Memory: 16 GB

New: 1.0 TB Hard disk: WDC WD10EZEX-00RKKA0

Unplugged old drives. Only the new drive connected.

Successfully installed windows 10 from CD.

Within Windows: Disabled fast startup.
                 Disabled secure boot.
                 Shrunk Drive C by 1/2 to make free space for Linux.

I ran Ubuntu 20.04 from a USB pen drive and selected INSTALL.

While installing, I created 3 new Linux partitions: /dev/sda2, 24 GB, Ext4, / target
                                                      /dev/sda5, 471 GB, Ext4, /home target
                                                      /dev/sda6, 17 MB, Linux Swap

Continued installation of UBUNTU 20.04 : Failed

ubuntu@ubuntu:~$ lsb_release -rd
Description: Ubuntu 20.04 LTS

ubuntu@ubuntu:~$ apt-cache policy pkgname
N: Unable to locate package pkgname

ubuntu@ubuntu:~$ /var/log/syslog and /var/log/partman
bash: /var/log/syslog: Permission denied

<email address hidden>

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubiquity 20.04.15
ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
Uname: Linux 5.4.0-26-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckMismatches: ./boot/grub/efi.img
CasperMD5CheckResult: fail
CasperVersion: 1.445
Date: Mon Nov 30 10:39:20 2020
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed maybe-ubiquity quiet splash ---
LiveMediaBuild: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)