i run ubuntu on a neebook and i did a full encryption when installing. My problem is that i can't boot from a usb, for example i tried to boot "Tails" and now i tried to boot the xp-installer but none of them show up in the boot menu. What can the problem be? I tried removing the encpyption but i can't do it. Can i remove the encryption to make it possible? My goal i basically to have a computer that i can run "tails" from.