Hi, I had the same bug since summer 2018. But for me, the following fixed the 
problem:
The bug was caused by a "no space left on device error" on the "efi firmware". 
There was a hint in the apt log.
So a colleague of mine (https://launchpad.net/~aburch) gave me the tip to 
delete dump files in
/sys/firmware/efi/efivars

There where hundred of files starting with "dump" and I removed only these!
This fixed it immediately. 

Can someone confirm that deleting these files is save? Is that the
trigger of the general bug?

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https://bugs.launchpad.net/bugs/1753518

Title:
  package grub-efi-amd64-signed 1.93+2.02-2ubuntu8 failed to
  install/upgrade: installed grub-efi-amd64-signed package post-
  installation script subprocess returned error exit status 1

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