On my old but light travel laptop I had Debian and Windows 7, which I could both boot from GRUB. I have replaced Debian with Kubuntu, but now booting Windows 7 from GRUB results in a black screen.
On thing I remember that I had to do installing GRUB after Windows, was to map the Windows partition as if it is the first on the disc. Adding these commands
drivemap -s (hd0) ($root)
to the boot entry for Windows, I ended up at this screen (summary):
Windows Boot Manager
A recent hardware or software change might have installed a file that is signed
incorrectly or damaged, or that might be malicious software from an unknown
If you have a Windows installation disc, insert the disc and restart your
computer. Click “Repair your computer“, and then choose a recovery tool.
Otherwise, to start Windows you can investigate further, press the ENTER key
to display the boot menu, press F8 for Advanced Boot Options, and select Last
Known Good. If you understand why the digital signature cannot be verified and
want to start Windows without this file, Temporarily disable driver signature
Info: Windows cannot verify the digital signature for this file.
After that, I can do a memory check but there are no other options than boot Windows and return to this screen. Because this is after GRUB (and I want to keep it there) I think the F8 option, or using a Windows disc, are not possible. I can mount the Windows file system in Linux, if anything needs to be done to
Does anyone know if this can be fixed before getting into Windows? For example, I put those 2 commands in the boot entry, but maybe other lines need to be deleted?