Ubuntu is really stupid about EFI. The installer sucks horribly. UEFI can absolutely do what you want. The best way to set up an external OS on a USB is, ideally, to disconnect every other drive ...

UEFI Boot (Secure Boot Disabled): Every system I have used which has UEFI firmware has had the possibility to disable Secure Boot, but still use EFI boot.

In other terms, EFI is a storage partition that goes with UEFI or Unified Extensible Firmware Interface. That being said, if you want to UEFI, you have to use the EFI as well.

Exploiting a known UEFI firmware vulnerability (e.g., CVE-2014-2961, CVE-2014-8274, or CVE-2015-0949) in the case of an outdated firmware version or a no-longer-supported product.

If you're wondering what your computer's BIOS or UEFI is, and whether or not you need to update it, you've come to the right place. I'll explain what these terms mean, what these pieces of ...

UEFI systems differ from manufacturer to manufacturer. In any case, however, they are clearly laid out, well structured and can be operated by mouse – as here with the Asus Zenbook 14X Oled.