In my case - on my Sony VAIO laptop, boot-repair did in fact install the grub also als "EFI/Boot/bootx64.efi" (backupping the old windows EFI loader). I did not find a way to change the EFI-Bootloader to use in BIOS on this Notebook, so this seemed somehow necessary (cannot find out now, why, that's ages ago).
But when I copied EFI/ubuntu/grubx64.efi to EFI/Boot/bootx64.efi (the new version, of course), everything went fine.
In my case - on my Sony VAIO laptop, boot-repair did in fact install the grub also als "EFI/Boot/ bootx64. efi" (backupping the old windows EFI loader). I did not find a way to change the EFI-Bootloader to use in BIOS on this Notebook, so this seemed somehow necessary (cannot find out now, why, that's ages ago). grubx64. efi to EFI/Boot/ bootx64. efi (the new version, of course), everything went fine.
But when I copied EFI/ubuntu/