No bootable partition after Ubuntu install

[Doctor Who]

On Sat, Apr 5, 2008 at 11:13 AM, Dotan Cohen <dotancohen at gmail.com> wrote:
>
> On 05/04/2008, Doctor Who <whodoctor at gmail.com> wrote:
>  > I have installed Ubuntu 8.04 beta from CD onto one hard drive (sda) on
>  >  machine with 3.total (including sdb and sdc).  I have other OSs
>  >  installed on this machine and use the graphical boot loader GAG to
>  >  launch each.  With each OS install, I have the installer put the boot
>  >  loader on the root partition of that install rather than the MBR.
>  >
>  >  This has worked fine until now.  With Ubuntu, it appears that when I
>  >  do the advanced options of the installer (step 7 of 7) and I tell it
>  >  to put the boot loader on /dev/sda1 it is not being respected as
>  >  Ubuntu will not boot with GAG pointing to this partition and the
>  >  partition is not being shown as bootable (No asterisk in the 'Boot'
>  >  column of 'fdisk -l' output).
>  >
>  >  My question is:  How do I make that partition bootable at this point.
>  >  It's not so much re-installing GRUB as launching GRUB and running
>  >  'find /boot/grub/menu.lst' of 'find /boot/grub/stage1' shows that
>  >  those cannot be found for /dev/sda1.  They *are* seen for my other OS
>  >  installs.
>  >
>  >  The drive is partitioned as /dev/sda1 as / (10GB), /dev/sda2 as /tmp/
>  >  (2GB), /dev/sda3 as swap (2GB), and /dev/sda4 as /home (460 GB).
>  >
>  >  Thanks for any assistance with this.
>
>  Make sure that BIOS is configured to boot from the drive with the boot loader.
>
>  Dotan Cohen
>

It is.  GAG comes up fine.  I can boot into my other OSs with no
problem.  It's just that /dev/sda1 is not a bootable partition and I
need to make it so.

Any ideas?