Changing grub default boot order

[Colin Law]

On 28 March 2013 23:25, Jim Byrnes <jf_byrnes at comcast.net> wrote:
> On 03/28/2013 03:14 PM, Colin Law wrote:
>>
>> On 28 March 2013 17:45, Jim Byrnes <jf_byrnes at comcast.net> wrote:
>>>
>>> On 03/28/2013 12:12 PM, Colin Law wrote:
>>>>
>>>>
>>>> On 28 March 2013 15:47, Jim Byrnes <jf_byrnes at comcast.net> wrote:
>>>>>
>>>>>
>>>>> I upgraded from 10.04 to 12.04 by installing 12.04 on a different hard
>>>>> drive
>>>>> and dual booting.  Now I would like to make 12.04 (sdb) the default.
>>>>> This
>>>>> link [1] suggests using grub-customizer [2]. Does anyone have any
>>>>> experience
>>>>> with this app?
>>>>
>>>>
>>>>
>>>> How did you manage to install 12.04 and not end up with it as the
>>>> default?  The question is relevant because you might be best to
>>>> reinstall grub from 12.04.
>>>>
>>>> Colin
>>>
>>>
>>>
>>> I put a new hard drive in the machine and disconnected the one with 10.04
>>> on
>>> it.  I then installed 12.04 on the new drive.  I wanted to keep the info
>>> on
>>> 10.04 available.  I had planned on using a drive caddy. At this point I
>>> had
>>> completely forgotten about dual-boot.  Once I had both hard drives hooked
>>> up
>>> this is what I ended up with.  Maybe there was a way to have 12.04 as the
>>> default but I didn't realize exactly what would happen.
>>
>>
>> I am going to suggest an alternative solution.  The problem, I think,
>> is that it is booting off the old disk.  I suggest changing the boot
>> sequence so that it boots off the 12.04 disk.  If you find that you do
>> not then get the boot option of 10.04 then run sudo update-grub.
>>
>> Colin
>>
>
> Yes it boots off of the original hard drive. 10.04 is on it as sda and it
> sits at the top of the grub menu.
>
> Are you suggesting that I fiddle with the bios.  I don't know if there is an
> option to select which hard drive to boot from. I had thought about it but
> never followed up.

Yes, adjust it in the bios.  If you have two drives I think you should
be able to select which one to boot from  Alternatively swap over the
two drive connections so that (I think) sda and sdb will swap, though
not absolutely certain whether that will achieve the same result.

Colin