I can't boot installation live cd in uefi mode but i need to install uefi version of Ubuntu.

I have Toshiba Satellite L50-A-19N with Win10.
I realy hate windows but i need it because of school and i want to use me external usb3 hdd for ubuntu.

I've setted boot order and turned off all options in uefi/bios setup like SecureBoot, QuickBoot, etc...
But the LiveCD installation disc is still booting only in bios mode and install bios version on hdd. But for easy booting i need uefi version of Ubuntu on HDD.

So, can you please tell me how to boot liveCD only via UEFI or how to convert bios Ubuntu into UEFI Ubuntu?

I want to install newest Ubuntu 14, thank you for answers.
(Sorry for bad english)