The same happens if the former jackalope-install used sda1 for grub and kernels 
and lvm /dev/mapper/ubuntu-jackalope for root.
it just assumes that all old systems boot from the new /dev/mapper/ubuntu-lucid 
even if it corrctly guesses the labels.

here are some lines from grub.cfg:
...
### BEGIN /etc/grub.d/30_os-prober ###
menuentry "Ubuntu, with Linux 2.6.32-16-generic (on 
/dev/mapper/ubuntu-jackalope)" {
        insmod ext2
        set root='(hd0,1)'
        search --no-floppy --fs-uuid --set 720da49e-1432-4601-9e1f-ac3335f1fa5e
        linux /vmlinuz-2.6.32-16-generic root=/dev/mapper/ubuntu-lynx ro quiet 
splash
        initrd /initrd.img-2.6.32-16-generic
}
...
menuentry "Ubuntu, with Linux 2.6.28-18-generic (on 
/dev/mapper/ubuntu-jackalope)" {
        insmod ext2
        set root='(hd0,1)'
        search --no-floppy --fs-uuid --set 720da49e-1432-4601-9e1f-ac3335f1fa5e
        linux /vmlinuz-2.6.28-18-generic root=/dev/mapper/ubuntu-lynx ro quiet 
splash
        initrd /initrd.img-2.6.28-18-generic
}
...

-- 
incorrectly assumes /dev/mapper/ -> LVM
https://bugs.launchpad.net/bugs/413345
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