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2.2.1. On a Real Computer
As a prerequisite, you need either a USB key prepared (as detailed in the previous section) or a DVD-ROM burned with a Kali Linux ISO image.
The BIOS/UEFI is responsible for the early boot process and can be configured through a piece of software called Setup. In particular, it allows users to choose which boot device is preferred. In this case, you want to select either the DVD-ROM drive or USB drive, depending on which device you have created.
Starting Setup usually involves pressing a particular key very soon after the computer is powered on. This key is often Del or Esc, and sometimes F2 or F10. Most of the time, the choice is briefly flashed onscreen when the computer powers on, before the operating system loads.
Once the BIOS/UEFI has been properly configured to boot from your device, booting Kali Linux is simply a matter of inserting the DVD-ROM or plugging in the USB drive and powering on the computer.
Disable Secure Boot While the Kali Linux images can be booted in UEFI mode, they do not support secure boot. You should disable that feature in Setup.
Disable Secure Boot While the Kali Linux images can be booted in UEFI mode, they do not support secure boot. You should disable that feature in Setup.