I have tried to install ubuntu 12.04 on my laptop, which is a dell inspiron 14z ultrabook, model number 5423. While booting with a pen drive, I selected the "try ubuntu" option. I then created the necessary partitions using gparted. Then when I tried to install ubuntu the install manager couldn't find the partitions created by me nor any other partition which was actually present.
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sudo fdisk -l
from a terminal on your live USB? – daboross Jun 15 '13 at 21:23