Note: If you have a dual boot machine, you can set up Ubuntu along with your existing operating system. Note: Make sure to disable legacy mode or secure boot, if your system has this option. If there is no bootable flash drive present, it will run the OS from the hard drive, as per usual. With this configuration in place, your computer will boot from the USB (if possible). Once you access the BIOS/UEFI, find the Boot Device Select Menu and set the USB as first in the Boot Order. The list of common keys for accessing the BIOS/UEFI is: Asus Just as accessing the Boot Menu, to open the BIOS/EUFI you need to hit the correct keys that correspond to the computer brand. If you are unable to boot from the USB this way, try doing it by opening BIOS/UEFI. Once you have accessed the Boot Menu, select the USB as the device to boot from and press Enter. This is the list of common keys based on the brand: Asus The keys that take you to the required menu depend on the brand of computer.
Note: You will receive a warning message that all data on the selected USB will be destroyed.