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I have a Windows 8 pre-installed laptop here.
I used UNetbootin to create a USB bootable drive for Ubuntu 14.04 x64. I resized my disk partition, and disabled secure boot.
Here's my situation:
In legacy mode: All bootable devices result in this:
Syslinux 4.03 2010-10-22 EDD Copyright (C) 1994-2010 H. Peter Anvin et al. I have to reboot and put the system back in UEFI mode to do anything.
In UEFI mode: I select the USB drive from the system boot screen (press f10), and get to the black menu (install Ubuntu, test without installing, check drives). I select install, and I’m thrown back into system boot screen (press F2 for setup, and F10 for boot device.. etc). I never get to the Ubuntu install screen. It loops between the USB Ubuntu install menu, and the system boot screen. I can only load into Windows 8.
⠀Acer Aspire v5-552G_080F_2_07
⠀CPU: AMD A8-5557M APU @ 2.1GHz 4 core
⠀Chipset: AMD - k15 IMC
⠀South Bridge: AMD - a76M FCH rev 2.6
⠀OS: Windows 8.1 x64 build 6.3.9600
⠀Hard drive: GPT format (500GB)
⠀Graphics: AMD Radeon HD 8550G 2GB DDR3