The error in your log is:
Setting up shim-signed (1.28~16.04.1+0.9+1474479173.6c180c6-1ubuntu1) ...
Installing for x86_64-efi platform.
grub-install: Fehler: Kann EFI Verzeichnis nicht finden.
dpkg: error processing package shim-signed (--configure):
subprocess installed post-installation script returned error exit status 1
Why is the /boot/efi directory not mounted on your system? This should
have been set up as part of the installation.
** Changed in: shim-signed (Ubuntu)
Status: New => Incomplete
** Changed in: shim-signed (Ubuntu)
Importance: Undecided => Low
** Summary changed:
- package shim-signed 1.28~16.04.1+0.9+1474479173.6c180c6-1ubuntu1 failed to
install/upgrade: subprocess installed post-installation script returned error
exit status 1
+ (/boot/efi not mounted) package shim-signed
1.28~16.04.1+0.9+1474479173.6c180c6-1ubuntu1 failed to install/upgrade:
subprocess installed post-installation script returned error exit status 1
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https://bugs.launchpad.net/bugs/1697750
Title:
(/boot/efi not mounted) package shim-signed
1.28~16.04.1+0.9+1474479173.6c180c6-1ubuntu1 failed to
install/upgrade: subprocess installed post-installation script
returned error exit status 1
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https://bugs.launchpad.net/ubuntu/+source/shim-signed/+bug/1697750/+subscriptions
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