Update - SOLUTION in post #10
I just got a brand new Dell XPS 13 with Windows 8 preinstalled.
I would like to install Ubuntu 12.10 x64 alongside Windows 8 from USB.
I downloaded Ubuntu 12.10 and put on a USB with the ubuntu startup disk creator program.
I plugged the usb into the LH side USB port and stared the computer.
From bios setup I tryed to disable secure booting as read somewhere but it keeps booting straight into W8.
Then I enabled legacy boot order and in this way, by pressing f12 I can select USB to boot from. In this way I get a text bootloader menu and I select try ubuntu. After ubuntu desktop come up, I run the installer but when it comes to the setup mode screen, it does not detect any operating system installed and offers me to clear everything and install ubuntu.
Is this due to the fact that I booted ubuntu in legacy mode? and if so, how can I boot in uefi mode and install it alongside windows 8? the documentation that i have read says that ubuntu 12.10 should support uefi booting even if secure mode.
Can someone help me please?
Thanks in advance.