Not only did I turn off the secure boot but the BIOS in my laptop (not a Sony) had me turn on (enable) the following.
-> Corporate Stable Model <- "CSM"
I can't know what Sony calls this but UEFI BIOS's are new and if you find more Linux discussions you see folk struggling with the "secure" boot issues.
This does not mean your laptop can run Linux. It's rather thuggish behavior by some companies to lock down PCs to just "8". Well, we saw this coming.
My Windows 8 is corrupted on my VAIO Sony Laptop, so I tried to install Ubuntu-12.04.2 to access my data. I didn't get very far, however, because after I selected to boot from 'internal optical drive' and 'enabled' for 'secure boot' in the UEFI, and put the Ubuntu CD in, the screen went black. Now, I can't get it to switch on again at all nor can I get the CD out of the drive. When I press the 'assist' button to boot through UEFI or the power button to boot normally, the power and battery lights illuminate for the amount of time I'm holding either button down but nothing else happens. It's a new laptop - model SVE151G13M - that I bought in Germany very recently but can't get fixed under warranty because I'm currently in South Africa and the warranty is not valid here. Please help me with any sort of information on this. It would be IMMENSLEY APPRECIATED! Thank you!