Two days ago I installed on my notebook Windows 8.1 and Ubuntu in dual boot. This is how i partitioned my HD:
Now from grub, booting Ubuntu gives no problems. But when I select "Windows Boot Manager" from here
there's an error:
Instead, selecting SYSTEM SETUP, and then Windows Boot Manager (see image below), Windows normally starts.
Now my question is: I have done some mistakes during installation? (I don't think, I installed Ubuntu and Windows carefully and manually partitioned HD).
It's a serious problem?
Thank you for your support.