Installed ubuntu ok, unsure how to boot

What steps will reproduce the problem?
1. Follow instructions :
http://code.google.com/p/atv-bootloader/wiki/AlternatePartitioning2
2.
3.

What is the expected output? Boot into lunix 

What do you see instead? Boot to penboot prompt

Please provide any additional information below.
I'm getting confused in the final stages of the instructions : "Follow one
of the install guides at the bottom of the previous page and install Linux
to /dev/sda5 with swap on /dev/sda6. Remember de-select all partitons other
than sda5 and sda6, install grub and build and run "gptsync" after the
install to fix up the MBR so efi firmware is happy.

Make a USB pen drive with just a recovery partition and the contents of
recovery.tar.gz. atv-bootloader is just the contents of recovery.tar.gz"

How should I install grub? Is the option to install grub expected to be
part of the install wizard? Or is this something I should do at the command
line : before or after rebooting?

I found the instructions for gptsync
(http://code.google.com/p/atv-bootloader/wiki/UpdateMBR).

But the other thing I'm confused about is what should the USB pen drive
contain? I have tried just the contents of recovery.tar.gz (booted to apple
recovery process), and with the contents of recovery.tar.gz plus the
boot.efi (booted linux and diplayed penboot login).

thanks
Paul

Original issue reported on code.google.com by pfru...@gmail.com on 15 Jan 2010 at 10:32

davilla / atv-bootloader

Installed ubuntu ok, unsure how to boot #31