This is my first time trying to install ubuntu. I am running a Toshiba Qosmio X875-Q7390 running Windows 8, firmware 6.30 (the latest). I had downloaded the ubuntu 64 bit iso file and used unetbootin to create a bootable USB drive. The flash drive is a SanDisk Titanium 4GB Cruzer. When I try to boot into the drive I get this error:
What should I do?Boot failure: a proper digital signature was not found.
One of the files on the selected boot device was rejected by the Secure Boot feature.