I have confirmed that grub-pc did not recognize usage of the /boot partition 
for the "other" Linux install. I was able to boot my Jaunty install after 
changing the UUID in the search option and modifying the kernel and initial RAM 
disk file names to be relative to /boot:
102,104c102,104
<       search --no-floppy --fs-uuid --set 9bdeb391-8fd9-48b1-9316-c4a00b7fa7a2
<       linux /vmlinuz-2.6.28-15-generic 
root=UUID=7f69072f-cea2-4ec3-bde9-81dd16744034 ro quiet splash
<       initrd /initrd.img-2.6.28-15-generic
---
>       search --no-floppy --fs-uuid --set 7f69072f-cea2-4ec3-bde9-81dd16744034
>       linux /boot/vmlinuz-2.6.28-15-generic 
> root=UUID=7f69072f-cea2-4ec3-bde9-81dd16744034 ro quiet splash
>       initrd /boot/initrd.img-2.6.28-15-generic

Following this, I installed grub-pc on Jaunty and after manually running
update-grub, I note that it found Karmic but did not include a separate
search line for that. I'm not sure it will boot Karmic using this
because I do not know if it requires the search line for those entries.
(Jaunty grub.cfg is attached.) If it uses the search specified for
Jaunty (points to separate /boot partition) it will not find the Karmic
kernel and initrd.

** Attachment added: "grub.cfg produced on Jaunty"
   http://launchpadlibrarian.net/33229091/grub.cfg

-- 
have run udate-grub2 and my other linux wont boot
https://bugs.launchpad.net/bugs/411705
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