[ubuntu] Dual boot, unable see my partition, nor disk.

Hi, I have a new shiny Dell XPS 13 2016 laptop, with win10, I am trying to set a Dual boot Win10/Ubuntu.

I have created a partition in win10, first in un-allocated, without success. Then convert it to ext3, then ext4(with Partition Wizard), none of this allowed me to see my partition when I boot from ubuntu live usb in UEFI.

I have already disable safe boot in Bios, and Fast start in win10, gpart, fdisk didn't retu anything about my partition, I just see 1 - sda, which is the usb drive itself.

I spent already a few nights on the problem, even tried with Mint as well, to be sure it wasn't ubuntu, all for the same result.

A bit of help would be much appreciated...