This is reported as an upgrade of the shim-signed package; you previously had 
shim-signed 1.33.1~17.10.1+13-0ubuntu2
 installed from Ubuntu 17.10, and are upgrading to version 1.34.9+13-0ubuntu2 
in Ubuntu 18.04.  But the errors in your report show that the system has no 
/boot/efi partition mounted, and efibootmgr does not detect this as a UEFI 
system.  Why did you have the shim-signed package installed?

** Changed in: shim-signed (Ubuntu)
       Status: New => Incomplete

** Summary changed:

- package shim-signed 1.34.9+13-0ubuntu2 failed to install/upgrade: installed 
shim-signed package post-installation script subprocess returned error exit 
status 1
+ (non-UEFI, present before upgarde) package shim-signed 1.34.9+13-0ubuntu2 
failed to install/upgrade: installed shim-signed package post-installation 
script subprocess returned error exit status 1

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https://bugs.launchpad.net/bugs/1772834

Title:
  (non-UEFI, present before upgarde) package shim-signed
  1.34.9+13-0ubuntu2 failed to install/upgrade: installed shim-signed
  package post-installation script subprocess returned error exit status
  1

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