VG10s? That must be a S55 series laptop, which I own now myself. You should be able to boot into legacy BIOS -- First, hit F2 to access BIOS on bootup. Next, disable Secure Boot on the 'Security' tab. Go to the 'Advanced' tab, and select 'System Configuration'. You'll see a 'Boot Mode' option. Change it from 'UEFI boot' to 'CSM Boot'. Save your changes, and you should be able to hit F12 to select to boot from ODD or USB, as appropriate.
I should mention one particular tricky issue with the 1.10 BIOS version I have on my laptop. When I switched the original hard drive to a new SSD I purchased without changing the boot option as I just mentioned, I was unable to enter the BIOS to change the settings until I replaced the original hard drive and performed a restart of the pre-loaded Windows 8 OS. It seems Windows must set some flag in the BIOS (for fast-startup purposes, perhaps?) that interferes with being able to pull up the BIOS if said flag has been set until a restart is made from the OS.
FWIW, Ubuntu 13.04 Live CD boots for me with UEFI on, but ONLY when the Built-in LAN is disabled -- must be some UEFI issue, if it's enabled I just get a black screen past the GRUB menu. This issue isn't present with legacy CSM, so I'm using that mode at the moment to boot.
Also of note, Windows 7 fails to boot under UEFI, setup hangs on the animated Windows logo splash screen right after the 'Loading Files' stage is done... which is another reason I chose legacy CSM boot.