Hello, I'm an agitated windows 8 user and I have been trying to install Ubuntu on my toshiba satellite laptop. (I also just want to wipe my drive, and switching OS seems to be a good way to accomplish that.) I downloaded the ISO from the Ubuntu site (I got 12.04.4 and 13.10, both receive the error.) I tried each one by using the "Universal-USB-installer-220.127.116.11" software. I chose the ISO, selected Ubuntu, and had it installed to my 4GB USB.
After having it installed on the USB, the USB comes up as "Install Ubuntu (E" under This PC. I powered off the laptop, and pressed F12 while powering it on. I entered set up and changed the boot options to boot from USB first. Once it began booting I immediately got the message "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."
Can anyone help me figure this out?