All we need is an easy explanation of the problem, so here it is.
I’m pretty sure my BIOS doesn’t support booting from a flash drive. I know my flash drive is bootable and already has installed Ubuntu on it. Is there any way to get my computer to boot from the flash drive without flashing the BIOS?
How to solve :
I know you bored from this bug, So we are here to help you! Take a deep breath and look at the explanation of your problem. We have many solutions to this problem, But we recommend you to use the first method because it is tested & true method that will 100% work for you.
Burn PLOP boot manager to a cd. This is effectivly a bootloader on a disc that will detect bootable interfaces.
Check this out from Ubuntu forums:
The HOWTO describes booting from a CD-ROM first with GRUB setup to boot the flash drive.
Note: Use and implement method 1 because this method fully tested our system.
Thank you 🙂