I agree completely with this
It is certainly possible, but more risk of failure to leave the internal drive connected. See what I recommend at the 'FromUSBSstick' help page: https://help.ubuntu.com/community/In...t_in_UEFI_mode
It is straight-forward to install Ubuntu 14.04.2 LTS (64-bit), ubuntu-14.04.2-desktop-amd64.iso in UEFI mode to the whole drive, when no other drive is connected in the computer.
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