Re: Samsung UEFI Laptop won't boot from Live USB (Preinstalled with Windows 8)
I think you must choose 'USB HDD' to boot from USB.
Have you checked the integrity of your downloaded .iso with MD5Sum Check? Also, can you confirm that the .iso has burned correctly to the USB.
If its a bad download then download Ubuntu.iso again.
If its a bad burn then burn the .iso to the USB again as instructed: http://www.ubuntu.com/download/desktop/create-a-usb-stick-on-windows
Boot Ubuntu in UEFI mode. Ubuntu installer does this automatically if it finds UEFI enabled. With UEFI you will get a black screen with options, with non-Uefi you will get the regular Ubuntu purple.
"Evolution is Nature's way of issuing upgrades."