I tried the following that was in a linked ubuntu forum that was sent to me further up the string:
If that doesn't fix the problem, you should try re-registering GRUB with your firmware's NVRAM. The way to do this that's most reliable is to use bcdedit in Windows. Open an Administrator Command Prompt window and type:
bcdedit /set {bootmgr} path \EFI\ubuntu\grubx64.efi
This managed to give me a menu with Zorin and Windows. Yay!!
While I’m getting closer the problem is that selecting the Zorin option gives me a black screen. Selecting windows works normally.
I’m wondering if I have to edit the script by inserting the “acpi=off spec_store_bypass_disable” that I had to have to get into Zorin setup from the usb stick. If so not sure where to add it, perhaps after quiet splash? Also, if it does work, how can I make it a permanent change and not have to edit it every time I boot up? And given the the acpi=off apparently turns off the cooling fan is that a good thing for other than temporarily?
Here’s the screen behind the Zorin choice that leads me to the black screen
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