First off, I want to apologize if this is a duplicate. I feel like I have scoured the internet and the forums here for an answer but none of the suggestions or how to guides are helping. Now, onto the problem.
My Ubuntu CD will not boot, no matter what I do. Every time I try to boot from a CD/DVD or USB, Windows 8 boots instead. I have already disabled Fast Start Up in my Power Options; I have disabled Secure Boot in my BIOS (I even left it enabled to see if that would work); I changed my boot up options in the BIOS to load either a CD/DVD or USB first (depending on which one I was using at the time); I used the boot up options menu to select which device I wanted to load from; I downloaded Ubuntu 12.04 64-bit AND 13.10 64-bit, created separate CD/DVDs of each, and even created a bootable USB device for each one (I was hoping that one of the CD/DVDs or USB sticks would work). I re-downloaded and re-created bootable CD/DVDs and USB sticks (after formatting the USB sticks), hoping that it was just a download error or image burn error that prevented from the CD/DVDs and USBs from not booting. I tried wubi, which will not fully install for whatever reason. I even updated my BIOS, hoping that would fix some kind of boot up problem. I just can't figure out why Ubuntu will not load.
I managed to get it to install when I changed to Legacy mode, but in order to go between the two operating systems, I'd have to change the BIOS from UEFI to CSM or vice versa. Am I missing something? Am I doing something wrong? I've dual booted Windows Vista and Ubuntu, and Windows 7 and Ubuntu in the past and it never caused any problems for me. Can anyone point me in the right direction?
My laptop is a Toshiba Satellite s55t-A5277 with Intel Core i7, 12 GB RAM, and 1 TB HDD (100 GB of which is partitioned for Ubuntu, if I can ever get it installed).
I appreciate any and all help I can get. Thank you.