Ubuntu 16.04 and Win 8 can't dual booting

[Xen]

Manolis L. via ubuntu-users schreef op 30-10-2017 10:45:

> Hello.
> My Pc had the following partitioning:
> 70GB (Win 7) , 60GB (Win8) και 568 GB (Data), all partitions NTFS.
> I could do normal dual booting as usual.
> Then I installed Ubuntu 16.04 and the partitioning  became:
> 70GB (Linux-ext4) , 60GB (Win8 NTFS) και 568 GB-NTFS.
> But the only choices at grub menu are : Ubuntu, advanced with Ubuntu 
> and mem tests.
> No option for Windows at all. I need Windows because I use them some 
> thirty years ago etc etc...

Windows 8 was probably listed in the BCD (boot configuration database?) 
of your Windows 7 partition.

What you can try is entering a Grub prompt at bootup (or press E to edit 
an exiting one and then change it but I'm sure you can get a prompt?)

And try the "ntld" command.

You can search for this command in the Grub help.

Something like:

insmod msdos
insmod ntfs
set root=(hd0,1)
ntld (hd0,1)

I don't know, could work.