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

[Wesley Werner]

Glad you got that sorted Charl, that is certainly a disaster warning.
Thanks!

On Thu, Aug 3, 2017 at 12:10 PM, Charl Le Roux <charl.leroux at gmail.com>
wrote:

> I agree, but maybe I was not clear. The installation of the creator
> edition was a normal Windows updated like any other update, just a 'big'
> one, and resulted in my ubuntu being trashed.
>
> On 3 August 2017 at 11:35, Alfred Charles Stockton <alf at stockton.co.za>
> wrote:
>
>> 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
>>
>>
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>> ubuntu-za at lists.ubuntu.com
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>>
>
>
>
> --
> Charl le Roux
> Mobile: +27834520405
> Email: charl.leroux at gmail.com
>
>
>
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>
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