Some more questions:

 - Is "Boot Order Lock" enabled on the affected system? (This is another 
feature in BIOS/firmware).
 - Please include the output of 'sudo efibootmgr -v'

** Changed in: grub2-signed (Ubuntu)
       Status: Confirmed => Incomplete

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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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