The error in your log is:

EFIBootMgr: Error: command ['efibootmgr', '-v'] failed with exit code 2:
efibootmgr: EFI variables are not supported on this system.

This indicates that the shim-signed package has been successfully
installed at one point, but that your system currently reports that you
have no EFI support.  Do you know why this is?

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

** Summary changed:

- package shim-signed 1.28~16.04.1+0.9+1474479173.6c180c6-1ubuntu1 failed to 
install/upgrade: Unterprozess installiertes post-installation-Skript gab den 
Fehlerwert 1 zurück
+ (non-UEFI) package shim-signed 1.28~16.04.1+0.9+1474479173.6c180c6-1ubuntu1 
failed to install/upgrade: Unterprozess installiertes post-installation-Skript 
gab den Fehlerwert 1 zurück

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https://bugs.launchpad.net/bugs/1708599

Title:
  (non-UEFI) package shim-signed
  1.28~16.04.1+0.9+1474479173.6c180c6-1ubuntu1 failed to
  install/upgrade: Unterprozess installiertes post-installation-Skript
  gab den Fehlerwert 1 zurück

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/shim-signed/+bug/1708599/+subscriptions

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