Just installed 12.04 and the behaviour is the same.

1) No option during install (clean install from live CD) to set the
default grub operating system (boot option).

I manually edited /etc/default/grub and changed the
GRUB_DEFAULT=<number>
line.

The ran:
sudo update-grub


2) I then ran an update and a new kernel was installed. The result of this was 
to add an extra menu item (a sub-menu) to the grub list called "Previous Linux 
versions".

As my previously set default was after this in the list it was not longer the 
default.
So I had to edit /etc/default/grub again.

Hopefully now with the "Previous Linux versions" sub menu grub entry any
new kernel updates will not affect the default.

Would it be possible to include the grub sub-menu "Previous Linux
versions" in from the start (first install) so that the number of items
in the grub menu list would not change when the first and any subsequent
kernel updates occur?

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https://bugs.launchpad.net/bugs/615139

Title:
  Ubuntu 10.04 Poor at Letting the User Choose the Default Operating
  System on Installation and During Kernel Upgrades

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