Grub2 and multiple boot different ubuntu versions

[sam]

On 03/24/2010 11:30 AM, Colin Law wrote:
> On 24 March 2010 15:21, Colin Law<clanlaw at googlemail.com>  wrote:
>> On 24 March 2010 14:41, Goh Lip<g.lip at gmx.com>  wrote:
>>> Colin Law wrote:
>>>
>>>> Hi
>>>>
>>>> I had a double boot setup with XP and Karmic.  I installed Lucid Beta
>>>> 1 in a separate partition and on boot it gives me the menu with Lucid
>>>> at the top followed by Karmic kernels and XP, and all works well.  As
>>>> Lucid is just for testing, however, I want it do default to Karmic
>>>> boot so I set GRUB_DEFAULT=5 in /etc/default/grub, run sudo
>>>> update-grub and again all is well.
>>>> Each time the Lucid kernel is updated, however, I need to add two to
>>>> GRUB_DEFAULT as there are new kernels above it.  I wonder whether it
>>>> is possible to rearrange the grub menu so Karmic is at the top and I
>>>> can leave the default at 0.  I have contemplated booting into Karmic
>>>> and running update-grub but I hesitate to do this in case it is a bad
>>>> idea, not really understanding how grub works.
>>>> It would be nice if grub allowed a regex setting for the default boot
>>>> when specifying a string, defaulting to the first matching name, but I
>>>> have not seen this in the docs.  It would seem like a trivial
>>>> extension.
>>>>
>>>> Colin
>>>
>>>
>>> Try 'saved' as default. Yes, it will boot last booted entry not a
>>> 'preselected' entry.
>>
>> I thought of that, but it is not really what I want.  If I boot into
>> lucid then power off I generally still want it to boot to karmic next
>> time.  Also, presumably, if there were a new karmic kernel (when
>> booted to karmic of course) on reboot it would presumably go to the
>> old one not the new one.
>>
>> I am about to try update-grub from karmic since Sam said it should be
>> ok and no-one has said otherwise.  If you don't here from me again
>> then I am presumably in the proverbial.
>
> Well that did not do any harm, in fact it did not change the boot
> menu, Lucid is still at the top.
>
> Colin
>
Sorry Colin,

What you really need to do is grub-install (not update-grub) from the 
karmic partition. I didn't look it up before responding. The 
grub-install command will install grub to the MBR with the 
/boot/grub/grub.cfg that you want to use (karmic's) which will give you 
the karmic options first then it will list the other OSes you have 
installed on other partitions.

sam