Comedy of errors -- Help

[kalpana]

I am attempting a dual-boot install Ubuntu 22.04.3 on a New Dell XPS 9530. The first install went fine, just turned off Secure Boot.
Now the sad part.

However, the windows partition was too large. So, booted up to windows 11 and shrank the "C" drive partition down. Windows booted fine after this.
I booted up the live CD and sized up the /home partition (gparted). I then did a reinstall and it went fine till the error-ed out with not being able to write GRUB to the drive.

Unable to install GRUB in /dev/nvme0n1
Executing 'grub-install /dev/nvme0n1' failed.

Install: error: cannot open '/boot/efi/EFI/ubuntu/grubxc64.efi': Not a directory.

I have tried every UEFI setting change, including turning off RAID and using legacy for the disk drives.

Any Ideas???