I have recently installed Ubuntu 12.04LTS on a Samsung NP355V5C, which is I think a series 3, and did not boot into windows at all. It is very easy.
As pointed out, you need an install CD or a UEFI boot USB. To do this, you can buy one, ask a friend to create one on his computer, or you could get the windows-8 set up on your PC, just to create the UEFI booting USB. When you have a USB ready, but not plugged in to the Samsung, switch the laptop on while holding down F2 to get to the BIOS. In here I altered the boot option to disable secure boot, but this is probably not necessary.
Windows 8 does not bypass the BIOS, but the BIOS is set to run the windows startup programs (you can see the setting in the BIOS). This disappears when you disable secure boot, but if you do want secure boot you can have it with ubuntu 12.10.
Reboot with the USB inserted, and take the options to install ubuntu as the sole operating system. This WILL create partitions and scrub off the windows-8, but if you just take the default options it does this automatically without you being aware of it. You (after restarting when prompted) will then be running the laptop 100% in ubuntu.
Everything I want works - sound, ethernet, wifi, DVD, etc. But if your laptop is an AMD processor like mine, in the ubuntu additional drivers you should select "ATI/AMD proprietary FGLRX graphics driver" to get resizeable starter icons and (they say) better graphic performance.