Here are my findings thus far:

1- Ubuntu does not detect any partitions during boot. (don't see them in
the file manager)

2-  Checking the system log, I get "unknown partition map" or something
similar to this.

3- Gparted (and parted-server when I run the installer) crash.
Runnung parted thru terminal, I get "Assertion (last_usable <= 
disk->dev->length) at ../../../libparted/labels/gpt.c:718 in function 
_parse_header() failed."

I verified my disk using GPT fdisk (gdisk) and verification was successful 
(found valid GPT and protective MBR)
Mac OS X disk utility verification finds no problems whatsoever.
Interestingly, I tried an Ubuntu 10.04 live CD I had and it detected the 
partition, Gparted works fine, partition are listed in nautilus, and I can 
mount them.

I suspect this issue is either related to parted binary or the newer
linux kernel.

Feel free if you have any questions.

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https://bugs.launchpad.net/bugs/945433

Title:
  gparted crashes on scanning GPT formatted drive

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