Dual boot problem - Vista disappeared from Grub menu

[Colin Law]

On 19 September 2010 22:56, Doug <dmcgarrett at optonline.net> wrote:
>  On 09/19/2010 10:14 AM, Colin Law wrote:
>> Hi
>>
>> On a machine with dual boot Ubuntu 10.04 and Vista which has been
>> working fine for many months, suddenly Vista no longer appears in the
>> boot menu (GRUB2).  I have not used Vista for a week so am not sure
>> exactly when it happened.  I am not aware of any problems in the
>> meantime apart from an update (don't know what to) which complained of
>> a download not being available, but this seemed ok when the update was
>> run again later.
>>
>> I have checked /etc/default/grub and run
>> sudo update-grub
>> which does not report the Vista partition.
>> I am able to access the files on the vista partition from Ubuntu and
>> it looks ok in gparted (showing the boot flag).
>>
>> Google reports lots of issues with grub disappearing after updating
>> windows but I could not find any reports of Vista disappearing.
>>
>> Any suggestions will be much appreciated.
>>
>> Colin
>>
> I have found some problems with different versions of grub, altho
> not ones that developed over time.  The "best" version I have is
> the one that came with PCLINUXOS.  You can run it off the live
> disk.  (It's not perfect either:  it seems to have found to
> versions of the same installed Linux distro!  There are 3 on the
> hd.)

I am not entirely sure what you are suggesting I do.

Colin