Am trying to install ubuntu bootloader to my windows 7 EFI partition and grub doesn't complete

[SpiritWarrior]

When I first ran the upgrade process I was able to upgrade from 16.04 to 18.04, but there was no longer a boot for ubuntu. I have been working this upgrade for days on my main pc, 16 gigs RAM, 8 gig graphics, many hard drives, Windows bootloader on sda but the side by side boot for ubuntu won't work. I've had successful dual boot uefi windows 7 / ubuntu 14.04 then 16.04 was a little problematic. But now the ubuntu EFI is thrashed ... until now, I could still boot into windows 7. I used the MBR EFi scheme for the CD image for booting because no other method worked. Now I can only run from the ubuntu 20.04 thumb drive with Casper.
Help!

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: 2.20.11-0ubuntu27.2
Architecture: amd64
CasperMD5CheckResult: pass
CasperVersion: 1.445
Date: Wed Jun 10 21:41:12 2020
InstallCmdLine: persistent file=/cdrom/preseed/ubuntu.seed initrd=/casper/initrd quiet splash --- maybe-ubiquity
LiveMediaBuild: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)