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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Bugs, which is subscribed to Ubuntu.
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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