I think I found a reasonable solution at
http://askubuntu.com/questions/143862/how-can-i-show-all-kernels-in-the-grub2-menu-ie-disable-submenu-previous-linu


On Mon, May 6, 2013 at 2:38 PM, Jon Schewe <jpschewe at mtu.net> wrote:

> I've been using Xen on OpenSUSE for a number of years and I use pygrub as
> my bootloader so that as the kernel gets upgraded in each VM everything
> just works. I've started migrating to ubuntu and notice that it uses grub2
> and adds submenus for old kernels. This submenu feature isn't supported by
> pygrub. Has anyone else run into this? What do you do for a bootloader for
> Xen with grub2 in your VMs, or do you use grub1, or a different bootloader?
>
> --
> http://mtu.net/~jpschewe
>
>


-- 
http://mtu.net/~jpschewe
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