Ubuntu 16.04 and Win 8 can't dual booting

[J. L.]

On 30.10.2017 10:45, Manolis L. via ubuntu-users wrote:
> 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...
> 
> So i run the fdisk -l and the output is:
> 
> ---------------------------------------------------------------------------------------------------
> manos at manos-TURBO-X-Laptop:~$ sudo fdisk -l
> [sudo] password for manos:
> Disk /dev/sda: 698,7 GiB, 750156374016 bytes, 1465149168 sectors
> Units: sectors of 1 * 512 = 512 bytes
> Sector size (logical/physical): 512 bytes / 512 bytes
> I/O size (minimum/optimal): 512 bytes / 512 bytes
> Disklabel type: dos
> Disk identifier: 0x26bd3833
> 
> Device Boot Start End Sectors Size Id Type
> /dev/sda1 * 2048 148062594 148060547 70,6G 83 Linux
> /dev/sda2 148064254 1465145343 1317081090 628G f W95 Ext'd (LBA)
> /dev/sda5 148064256 1339246591 1191182336 568G 7 HPFS/NTFS/exFAT
> /dev/sda6 1339248640 1465145343 125896704 60G 7 HPFS/NTFS/exFAT
> 
> 
> manos at manos-TURBO-X-Laptop:~$
> ---------------------------------------------------------------------
> 
> 
> 
>  So the question is the following: According to this output is at the disk a correct and usefull  win8 partition or not ;In other words does this disk contains two kernels or just one -that of linux ?
> Thanks a lot friends.
> 
> 
> 


Hi!

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.

Good luck!

J. L.