I want to install Trusty on a system with EFI / secure boot, but not on the first disk. I'd rather prefer to have it from a USB device (stick or USB drive) which I would like to be portable.
Bottom line, I want to have a portable installation - not in a squashfs or other layers in-between - on USB for EFI systems. So far, the EFI install instructions all assume that you want to install on disk #1, which should stay as it was to make the install portable. Trusty mainly for the fact that it's the newest and should support this best, as of tomorrow, it will have feature freeze, so no moving target.