I have been using a workaround submitted by Ronan Mooney, listed as #11 
on https://bugs.launchpad.net/ubuntu/+source/grub2-signed/+bug/1753518

The workaround has enabled me to complete upgrades.

On 2/12/19 10:09 PM, Mathieu Trudel-Lapierre wrote:
> I'm unable to reproduce this. I've tried upgrading from bionic to
> cosmic, or various partitioning set ups. Clearly there is something
> special about some set up that can cause this kind of issue, but I'm
> unsure what it could be.
>
> Could you please tell us more about how your system was installed that
> could help reproducing the bug?
>
>   - Is it upgraded from previous releases before the bionic -> cosmic upgrade?
>   - Is there a special partitioning done?
>   - Is "CSM" enabled in the BIOS with the UEFI mode?
>   - Is there anything else you can say about the affected systems that could 
> help us reproduce the issue?
>

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https://bugs.launchpad.net/bugs/1805490

Title:
  Grub2 Failed to install "efibootmgr failed to register the boot entry:
  Block device required."

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