I installed Fedora a few months ago on my Sony Vaio model PCG-71511L laptop.
I created a DVD and even a USB flash drive with Ubuntu. When I restart my laptop, it restarts and runs Fedora.
Pressing Delete, F2 or F10 when the system is booting has no effect. The boot process continues, arrives at the Grub Boot Menu from Fedora and then boots to Fedora.
It seems that I am somehow locked out of my BIOS setup, and therefore I can't change the boot order so that I can boot from a live DVD or live USB flash drive.
How do I get my laptop to boot from either a DVD or a flash drive so that I can install Ubuntu and completely wipe out Fedora?