I have tested GPT on non Mac system (VirtualBox).
1) Used gparted LiveCD to create GPT with 4 partitions. As result MBR contained 
protective MBR with single partition covering whole suface.
2) Booted in to latest Daily Lucid. Instructed installer to change type of 1 of 
4 partitions and use 3 of 4 availbale.
3) Ubiquity finished successfuly.
4) Rebooted into fresh system.
5) Found that GPT is ok but MBR now contain 2 partitions:
    First one was previosly available protective
    Second was: Bootable, start=1, end=1, size=0, id=0 and type=Empty. What is 
that?

>From all above I can conclude that issue is severe on Macs but non-Macs are 
>not too safe either.
I think gpt-sync patch in parted must be reviewed ASAP, before people start 
testing Lucid betas on Macs...

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Linux fails to read GPT(EFI) partition table created by both GNU parted and OSX 
diskutil
https://bugs.launchpad.net/bugs/538100
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