I've managed to install ubuntu 10 on an external hard drive using my mbp (mid 2008) model. The installation was successful, however, when i rebooted my mac and try to select a boot drive, my mac failed to identify my external HD as a boot option.

I read somewhere online that i need to install EFI? However, they were all step by step processes... since i've installed the OS on my external already can still setup EFI? or do i need to erase the install and restart the whole process?

Please advise.

Thank you