Ubuntu 16.04 and Win 8 can't dual booting

[Xen]

Liam Proven schreef op 30-10-2017 18:49:
> On 30 October 2017 at 18:27, J. L. <jl.ffm at gmx.net> wrote:
> 
>> Most likely but i'm not absolutely sure as i do not know how Your 
>> system
>> was exactly configured beforen the Linux-installation the cause for 
>> Your
>> problems is that You deleted the _first_ Windows-partition with 
>> Windows-7.
>> 
>> "Usually" one would assume that Windows 7 has been installed before
>> Windows 8. And Windows usually places its boot-loader in the first
>> Windows-partition which in Your case unfortunately has been changed 
>> and
>> lost to EXT4.
>> 
>> You should try to (semi-)-"automatically" recover Your
>> Windows-8-installation by booting from the DVD and to "repair an
>> existing Windows-installation".
>> 
>> Hopefully You did not have any relevant data in Your first partition 
>> as
>> after EXT4-ing it most probably all existing data on this partition 
>> has
>> been lost.
> 
> This.
> 
> If the OP installed Win8 _after_ Win7, they'd have shared a boot
> loader. Win8 could have been removed OK but removing Win7 would render
> Win8 non-bootable.
> 
> It _might_ be possible to fix the Win8 installation using Startup
> Recovery from a Windows boot disk.

I guess Win8 might not have its own BCD store which means it just 
piggybacked on the Win7 installation.

If Win8 does have a store though it might be possible to still boot Win8 
using a loader command directly, but since Grub doesn't find anything, I 
guess not.

Doesn't hurt to try though.

I thought Windows didn't like to be installed on anything other than the 
first partition (I mean for the bootloader) but yeah.

Wiping win7 was not that smart, or not having a separate boot partition 
to begin with, but I guess it was not mandatory in Windows 7.

Fingers crossed that the command:

....

Oh yeah.

To Manolis L:

To fix Windows boot you generally only have a single tool available.

Boot the Windows 8 (or Windows 7) DVD and wait till it loads.

Then press Shift-F10.

Enter:

bootrec /scanos

If it finds your installation:

bootrec /rebuildbcd

And hope for the best.

bootrec /fixboot is also possible but don't use bootrec /fixmbr or 
you'll lose Grub.