So I created a bootable Ubuntu pendrive. When I reboot, it just goes straight to Windows. Same thing if I boot from UEFI or if I change the boot order to external. It just won't do anything. I'm running Windows 10 and want to dual-boot with Ubuntu 14.04 (I think that's the one). Thanks!
EDIT: I downloaded the latest build of Ubuntu, been hearing about 14.04 not working on some Windows 10 computers (if not all). I tried booting into Legacy, and it worked...sorta. It showed me the installation options, but as soon as I typed something, it would report an error, and then I would be stuck in a terminal with no way to access anything. Reverted back to windows to download the latest build. I'll let you guys know if it works.
EDIT EDIT EDIT: After updating, it seems it is working. Thank you all for your help!