Grub2 and multiple boot different ubuntu versions

[sam]

On 03/24/2010 05:34 AM, 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
>
  I think the easiest solution is to boot into Karmic and run 
update-grub from there and have Karmic's grub overwrite the MBR.

HTH,

Sam