I have a Gateway netbook that has already been fully wiped with nothing on the hard drive. There is no Legacy option in bios and the only thing I can boot from the USB is a Gparted disk utilizing Grub/EFI loader in which I can partition the drive. But nothing else will boot from USB including Boot Repair, ReFINd, multiple Linux Live CDs, or Super Grub disks. Ubuntu installation disks won't show up, there is no boot loader on the hard drive and I don't know how to get anything installed. It seems to be a UEFI motherboard PC without a bios boot option. All the articles I am coming across deal with dual boots on EFI, or Windows 8 machines. Mine was a Windows 8 preinstalled machine that no longer has Windows on it. Any guidance on installing a boot loader and Ubuntu would be much appreciated.
There is much variation in hardware, but I was able to boot to an Ubuntu 14.04 live USB in UEFI / Secure Boot mode by doing the following:
1) Download the Ubuntu distro you want. It must be the 64 bit version.
2) Install the distro to USB stick using PendriveLinux.com's Universal USB Installer.
3) Power off the PC, insert the USB stick, and power on.
4) Hold down the appropriate key to enter the BIOS.
5) Change the boot order so that the USB stick is first
Note, unlike regular BIOSes I am used to, you have to do this step EVERY TIME YOU WANT TO BOOT OFF USB. The boot order changes are not persistent! In fact, my UEFI BIOS does not even offer me this choice unless a UEFI bootable USB stick is currently inserted Until I figured this out, I was in the same situation as you, I could not get it to boot off USB at all.
6) Exit the BIOS "saving" your changes and allow the boot to complete.
I ended up solving this issue. I found out that even though the netbook was a newer model it was actually 32 bit. Therefore none of the 64 bit disk images would boot because they only contained 64 bit EFI drivers. I ended up...
- Downloading a 32 bit version of Linux Mint (which didn't have EFI support).
- I took the EFI folder from Gparted boot disk (which also had 32 bit EFI drivers) and copied it to the Linux Mint USB. This explains why only the Gparted disk would boot when others wouldn't.
Booted instantly, installed successfully, and is running like a charm. Loving Linux Mint 17!!!