[ubuntu-za] Dualboot with Windows 10 and upgrade to 1703

[Alfred Charles Stockton]

I have made it a rule that Linux get installed after Windows, not the
other way around.
Apparently Linux knows what it is doing Windows not so much.

> Just a word of caution to anyone who dualboots with Windows 10.
>
> I recently installed the 'creator edition' update (1703) and Windows
> deleted my Ubuntu partition and grub to the extent that I was not able to
> recover it. I had to re-install.
>
> It seems that Windows 10 attempted to convert my OS disk from MBR to GPT
> and in the process ignored that fact that I had another OS installed. On
> startup of windows it reverted to the old state, including MBR, but the
> damage was already done.
>
> I did the following to recover:
> - Reinstalled Ubuntu- after which I was not able to boot Windows.
> - I then converted the disk to GPT using gdisk utility (booting from live
> CD)
> - From live CD I had to chroot into my ubuntu to install grub-efi, map the
> efi partition to /boot/efi, and update grub (which did not find the the
> windows)
> - I then changed bios to boot using UEFI
> - Now I was able to start ubuntu from grub via uefi(on gpt disk)
> - To recover Windows boot I had to boot from recovery usb, use diskpart to
> assign a drive letter to the efi partition.
> - Then I had to run bootrec /scanos, bootrec /fixmbr, bootrec /fixboot,
> bootrec /rebuildbcd
> - I was now able to boot into Windows again but no grub
> - I was able to boot into Ubuntu from the BIOS UEFI selection screen and
> installed grub
> Then:
> apt-get install --reinstall grub-efi
> grub-install /dev/sda
> update-grub
> - Now all is well and booting faster than ever (assuming it's gpt and
> uefi)
>
>
> What a desaster, it took be the best part of a day and a half to figure
> this out. The above is not step by step but just what I can remember off
> the top of my head.
>
> My take away from this:
> - Make sure our disk is GPT partition scheme if you dual boot with Win10
> before you update to the 1703 version.
>
> Hope this helps someone.
>
> Regards
>
>
>
>


-- 
Regards,
Alf Stockton