Comment # 2 on bug 1191930 from Reimar Imhof

What I didn't tell: There are three computers with the same problem.
On all three computers shim is version 15.4-4.7.1

On the first one (aldi medion) shim-install did the trick, but when booting
(every boot) it says: 
"Create new secret key sk ...
EFI_RING_PROTOCOL unavailable, hibernation secret key is not generated:
EFI_NOT_FOUND".
At least the first system is booting with secure boot enabled but without
option to hibernate.

On the other systems (Lenovo IdeaPad, and Lenovo IdeaCentre) shim-install
failed with: "'/boot/efi/EFI/boot' cannot be created: The file is already
existing."
The error message is a little strange. I see, there is a directory 
'/boot/efi/EFI/Boot' (named "Boot", not "boot").
I don't know if it's save to rename "Boot" to "boot". Will this break the whole
system (opensuse and win10)? But if this name exists on real systems, shouldn't
shim-install care about it?