Allowing boot of Ubuntu on a Acer Aspire v5-531 with UEFI

I was trying to install Ubuntu 14 (64-bit) on a Aspire V5-531, preinstalled Win 8. In the bios I can flag:

boot mode UEFI, secure boot DISABLE

• in this case the neither installation USB card nor cd rom start

boot mode in Legacy Mode

• I can install Ubuntu 14, but grub doesn't work (yes, I used boot repair, but it doesen't work properly).

So I resolved in the simplest way:

• let boot mode UEFI enable, secure boot enable
• in bios added the USB boot file of the distribution I want to install as trusted for executing:
  • My bios is: Phoenix SecureCore Tiano Setup
  • under Boot I flag Boot Mode UEFI
  • Secure Boot ENABLE
  • under SECURITY i select: "Select an UEFI file as trusted for executing"
  • in "Available File System" i select fs0:$nameofmyusbkey
  • select [EFI]
  • select [BOOT]
  • select BOOTx64.EFI
  • give it the name "whateveryouwant" then, using tab, select YES.
  • so I go to the Boot option, then put "whateveryouwant" as first in the Boot priority order
  • then I was able to start Ubuntu installation in UEFI mode! :)

WARNIG!

before I did all them, I free the space for my partitions under win8, I read so many guide about UEFI and UEFI install (I give advice to do it!), and try in several way. That was the only way I was able to do what I want