FAI 5.1.2 grub problem

[Hannu T. Pysäys]

Hi, 


I have a grub problem (Debian 8.5 / FAI 5.1.2) , GRUB_PC always fails with 
following code:

GRUB_PC/10-setup     FAILED with exit code 1.
Can you provide me pointers where to start look this issue? 


best regards, Hannu