[ubuntu-za] Can't Boot after Windows 10 upgrade

[William Walter Kinghorn]

Hi Robin,

Boot with the Live DVD

Then open each partition, and see what the contents are, is it NTFS, ext4, as well as the size of the partition

>From that you should be able to see which is which

If you are using Ubuntu Live DVD, you can use the GUI app called disks to do the above, I think it is on the live DVD

William
________________________________________
From: ubuntu-za-bounces at lists.ubuntu.com <ubuntu-za-bounces at lists.ubuntu.com> on behalf of wesley werner <wesley.werner at gmail.com>
Sent: 11 February 2016 06:58
To: Ubuntu South African Local Community
Subject: Re: [ubuntu-za] Can't Boot after Windows 10 upgrade

On 09/02/2016 14:18, Robin Bownes wrote:
> On 9 Feb 2016 13:08, "Robin Bownes"
> <<mailto:robin at bownes.co.za>robin at bownes.co.za> wrote:
>  >
>  > Apparently, from some reading I've done - which unfortunately didn't
> give me anything I felt confident trying to do - the Windows upgrade
> overwrites part of the partition table, but not the contents of the
> partition. That is why the previously Linux partition now shows up as
> "unknown".
>  >
>  >
> So the partition is still mountable from a live disk then?

Hello Robin

That is possible assuming the data is still intact. The trick is finding
out which partition contained Ubuntu:


Model: ATA WDC WD3200BEKT-7 (scsi)
Disk /dev/sda: 320GB
Number  Start   End     Size    Type      File system     Flags
1      1049kB  5692MB  5691MB  primary   ntfs            diag
2      5692MB  65.3GB  59.6GB  primary
3      65.3GB  65.8GB  472MB   primary   ntfs            boot, diag
4      65.8GB  320GB   254GB   extended
5      316GB   320GB   4082MB  logical   linux-swap(v1)


Partitions #1 and #3 seem to be for windows recovery, #2 windows itself,
and #5 the Ubuntu swap.

The discrepancy I notice is that partition #4 reserves 254GB (extended
partitions are not real partitions but a grouping of other partitions),
of which only 4GB is allocated to the swap. There is 250GB not allocated.

I dare to say there used to be a partition #6 that was 250GB and
contained Ubuntu, but why it would have been removed is beyond me, and
why the swap was left intact even more so!

Since that space is unallocated it will (to your luck) not be written
into, the data might still exist. As a last resort you can use fdisk or
gparted to re-create partition #6 using the unallocated space, and try
mount it. Assuming there was a #6 and it used the rest of the
unallocated space, and windows did not resize it into itself in some part.

There are various other partition recovery methods mentioned online and
you might try those before re-creating the partition as I mentioned
above, but recovery is at the very least a complex task.

Wesley

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