I have tried different methods to do this, but almost always same point fails.
Normally when i boot into USB (or DVD, via USB) the install starts, but nothing happens for an hour. This is the most I've waited so far, wheel just keeps spinning... this happens after the selection of language and upgrades / propietary software.
I have followed different guides from Ubuntu sites, and also done the USB with different tools.
Only thing i can think now is this:
I have replaced my DVD with second SDD. Can this be the cause of this problem?
Normally when i boot to install with USB, i have to unplug externeal USB3-Hub so that only have the USB stick directly on my MBP. If i have external USB3-Hub connected i get reboot or freeze. I can connect the Hub after the LiveCD has booted and i'm on the desktop.
I can also install wireless and NVidia drivers when i'm in the LiveCD, or use my iPhone as wireless Network when i'm just trying to install directly.
Partition that have include OSX and Bootcamp (Win 8.1). I have tried also to install to "empty" space in Bootcamp or second SDD and so that i would resize the Win 8.1 size.
.. . and i use rEFIt on my MBP.
Any help ?