I'd like to install Ubuntu Precise (current LTS) on a drive, and I'd like to discard the current partitioning and instead create a new GPT on that drive. The ubuntu installer allows me to partition the device, and even allows me to create a new partition table, but I find no option to choose what kind of partition table I want, and the fact that subsequent creation of partition offers me a choice between primary and extended suggests that it will always create a MBR partition table.
So how can I create a GPT during install? Is there some more advanced install tool? Should I do this from the command line?