multiboot fails -- debian + ubuntu

["Russell L. Harris" <rlharris@broadcaster.org>]

I installed Debian stable (Squeeze) and Debian testing (Wheezy) on a
single drive (multi-boot), then I installed Ubuntu
10.04.3-desktop-i386.  In addition to a partition for each OS, the
drive has a /boot partition and a swap partition.  

When installing Ubuntu, I UNchecked the "install boot loader" box.
After installing Ubuntu, I booted Debian stable and executed
"grub-install".  But when I restart the machine and attempt to
boot Ubuntu, I get the following message:

    error: no such device: 210e7d19-fd27-4e2e-82a6-6538cdc38fe9.
    error: file not found.
    error: you need to load the kernel first.

    Press any key to continue...

The Grub entry for Ubuntu is as follows:

GNU GRUB  version 1.99-11

setparams 'Ubuntu, with Linux 2.6.38-11-generic-pae (on /dev/sda7)'

insmod part_msdos
insmod ext2
set root='(hd0,msdos7)'
search --no-floppy --fs-uuid --set=root 210e7d19-fd27-4e2e-82a6-6538\
cdc38fe9
linux /boot/vmlinuz-2.6.38-11-generic-pae root=UUID=210e7d19-fd27-4e\
2e-82a6-6538cdc38fe9 ro quiet splash vt.handoff=7
initrd /boot/initrd.img-2.6.38-11-generic-pae

RLH