The error in your log is:
shim-signed (1.28+0.9+1474479173.6c180c6-1ubuntu1) wird eingerichtet ...
x86_64-efi wird für Ihre Plattform installiert.
grub-install: Fehler: EFI-Verzeichnis kann nicht gefunden werden.
dpkg: Fehler beim Bearbeiten des Paketes shim-signed (--configure):
Unterprozess installiertes post-installation-Skript gab den Fehlerwert 1 zurück
But your bug report also shows that your system does not have EFI
support enabled. Do you know why the EFI version of grub is installed
if your system is not booted using EFI?
** Changed in: shim-signed (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1696307
Title:
package shim-signed 1.28+0.9+1474479173.6c180c6-1ubuntu1 failed to
install/upgrade: Unterprozess installiertes post-installation-Skript
gab den Fehlerwert 1 zurück
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