Hello
First, be aware that SecureBoot is recent, and GRUB/Ubuntu/Boot-Repair are not always able to work with SecureBoot enabled.
But we can have a try.
Please enable SecureBoot in your BIOS, then run Boot-Repair --> Advanced Options --> "GRUB options" tab --> tick "SecureBoot" --> Apply.
Tell us the new URL that will appear.
Reboot, and tell us what you observe.
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