I'am not sure whether this will solve my problem:
I found out that the "grubrescue>" terminal also allows me to run an ls command:
now i can see a /usr/lib/grub/x86_64-efi directory (which contains a lot of 
files).

when I start a terminal from the boot repair disk, i can't see this
directory.

Is grub maybe installed twice on different paritions, but unfortunatley
it starts the wrong boot loader??

is there any chance to to install grub from a terminal by forcing to chose the 
right place where it should install?
I found from the internet that grub-install would be the right command and that 
I can also append a path to it but I don't know which path...

Any suggestions?
Gerald

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https://bugs.launchpad.net/bugs/1187345

Title:
  package grub-efi-amd64 2.00-13ubuntu3 failed to install/upgrade:
  Unterprozess installiertes post-installation-Skript gab den Fehlerwert
  1 zurück

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