I have bought a new laptop Toshiba with Windows 8 as operating system, and I wanted to change it to Ubuntu 14.04 LTS I am familiar with, but every time I tried to boot my USB and install Ubuntu 14.04 LTS on my laptop it was in vain, because every time appears a message of failure.
If it's a windows 8 laptop, it might be a problem with secure boot, a technology that keeps non-windows OSes from loading. I don't know if Ubuntu is able to boot with secure boot turned on or not, but turning it off is worth a try. I'm not familiar with Toshiba's UEFI BIOS, but there should be lots of guides online. Just google "disable Toshiba secure boot" and you should find something.
Best of luck!