The error in your log is:
Setting up shim-signed (1.28+0.9+1474479173.6c180c6-1ubuntu1) ...
x86_64-efi wird für Ihre Plattform installiert.
grub-install: Fehler: EFI-Verzeichnis kann nicht gefunden werden.
dpkg: error processing package shim-signed (--configure):
subprocess installed post-installation script returned error exit status 1
Please attach /etc/fstab from this system.
** Changed in: shim-signed (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1683028
Title:
package shim-signed 1.28+0.9+1474479173.6c180c6-1ubuntu1 failed to
install/upgrade: subprocess installed post-installation script
returned error exit status 1
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