After installing Ubuntu, I have a flciker question mark inside a folder

Hello all,
I try to install Ubuntu on a external hard drive, but when i try to boot the mac it only appear a flashing question mark inside a folder.
I have unplug the external drive, try to erase de NVRAM, try to reinstall SL, but I haven't solve the issue.
Also i have format the HDD of the Mac, and repair it. I think the problem is on the boot partition and not in the HDD, because the disc installation of SL recognise my HDD.
Can anyone help me?
P.D: Sorry for my english
I don't know what to do. Can anyone help?

Hello!
A person in another forum has told me to see this article,
http://www.macosxhints.com/article.php?story=20091111185717745
I will test tonight, but someone can give me other ideas?

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After installing Ubuntu, I have a flciker question mark inside a folder

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