*** This bug is a duplicate of bug 1766945 ***
    https://bugs.launchpad.net/bugs/1766945

Ok, then I believe your issue is at its root a duplicate of LP:
#1766945.

Because the install has completed and you don't have an EFI System
Partition, the grub-efi-amd64-signed and shim-signed packages cannot
work on your install.  Short of repartitioning your system, you should
probably resolve this by doing:

 sudo apt autoremove --purge shim-signed grub-efi-amd64-signed grub-pc+

That will properly install the BIOS GRUB package and remove the EFI
packages.

** This bug has been marked a duplicate of bug 1766945
   (EFI on top of legacy install) choosing "replace" or "resize" options in 
partitioning may lead to an install failure

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https://bugs.launchpad.net/bugs/1779560

Title:
  package shim-signed 1.34.9.1+13-0ubuntu2 failed to install/upgrade:
  installed shim-signed package post-installation script subprocess
  returned error exit status 1

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