take a look at the grub 2 guide on ubuntu forums... It is fairly detailed.

http://ubuntuforums.org/showthread.php?t=1195275

But basically (if I remember right), look at the OS listings in menulist and
count them starting at 0. in /etc/default/grub find the line that says
GRUB_DEFAULT=0, and change the number to the OS you want. then run sudo
update-grub

if you change the value from "0" (zero) to "saved", you can also select the
default by doing sudo grub-set-default X where "X"= either the # or the
exact string of the menulisting for the os you want to boot. You'll need to
enclose the string in quotes if you go that route.

Hope that helps

btw, your last post reminded me of that video of the kid who points at
specific places on a US map then dances around while her dad sings
"smarty-pants dance smarty-pance dance"... that is now stuck in my head.