Configuring Grub with reFit to boot debian kfreebsd installed on external drive
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I have a macbook pro that has an internal hard drive with OSX and Ubunut installed. I use rEFIt to choose the linux distro when I want to boot to ubuntu.

I want to install debian kfreebsd to an external hard drive, and configure it so that I can also boot to that disk.

I did an automatic install of kfreebsd onto the external drive. Should I allow it to do a grub MBR install there? Should I boot into ubuntu and try to edit grub there? If that is the case, what would I have to add to grub in ubuntu to make it pick up my kFreebsd install?

Thanks