[SOLVED] Re: Changing grub default boot order

[JD]

On 03/29/2013 01:00 PM, Colin Law wrote:
> On 29 March 2013 18:01, Jim Byrnes <jf_byrnes at comcast.net> wrote:
>> On 03/29/2013 12:40 PM, Jim Byrnes wrote:
>> <snip>
>>
>>
>>>>> I also found some info on the web about changing GRUB_DEFAULT=. I tried
>>>>> changing it to GRUB_DEFAULT=14. (sdb1 is on line 15) and I tried
>>>>> changing it
>>>>> to "Ubuntu, with Linux 3.2.0-39 generic (on /dev/sdb1)". Both of
>>>>> these were
>>>>> suggestions I found on line but neither worked.
>>>>
>>>> You may be changing it on the wrong file.  Remember there will be one
>>>> on each disk.  I think as you have it you probably have to boot into
>>>> the old ubuntu (so the default boot) and change it there.  this is
>>>> going to cause continuous confusion however, hence my suggestion to
>>>> boot off the second disk by one means or another.
>>>
>>> Something else I never thought of.  Not sure what confusion you are
>>> referring to here. Anyway I am going to try this before making anymore
>>> physical changes.
>>>
>> Changing both files worked.  The sdb1 line is highlighted and it boots to
>> 12.04.  The only side effect seems to be sda1 line no longer appears in the
>> menu.  I can curor up to the first kernal entry and boot to 10.04 so that's
>> not a problem.
> The reason I said that there may be confusion is that if the kernel in
> 12.04 is updated and it runs update-grub I am not sure that the right
> files will get updated for the new kernel to appear in the menu.
> Someone who knows more about how it all works would have to answer
> that.
>
> Colin

That is why I had asked: during install of 12.04, on which
disk did the OP choose to install the grub.
If he had chosen sdb, the while booting and running off of sdb, and
the system is updated, the new kernel will indeed reside on sdb.
If the OP had chosed sda, then the new updated kernel will go
to sda.

>
>> Thanks Colin for this solution.
>>
>> Regards,  Jim
>>
>>
>>>> Alternatively, you could boot into the new Ubuntu and, assuming that
>>>> it is booting of /dev/sda, then run
>>>> sudo grub-install /dev/sda
>>>> and
>>>> sudo update-grub
>>>>
>>>> That should re-install grub with the new one as the default.
>>>
>>> The new Ubuntu is on /dev/sdb. Not having a real good idea of how all
>>> this works I worry a little abut this confusing my system.
>>>
>>>> You have backed up everything important on both disks before doing any
>>>> of this haven't you?  There is always some risk involved in this sort
>>>> of activity.
>>>
>>>
>>> As luck would have it I just did a full backup yesterday.  I spent the
>>> first part of the week working with a the author of Backintime to get it
>>> to do a snapshot of my system.  There was nothing wrong with Backintime,
>>> I made a couple poor choices in what to backup.  I might add that he was
>>> very supportive and worked with me until I was able to get a good backup.
>>>
>>>
>>> Regards,  JIm
>>>
>>>
>>
>>
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