I followed the instructions exactly to install Ubuntu Desktop 12.10 on a USB stick, then make it bootable with LinuxLive, but when I rebooted, nothing happened-it simple booted into the normal Windows 7. I made the USB first in the boot order, booted from the stick with the boot menu itself, but still nothing. I also tried using Unetbootin instead of LinuxLive, but neither worked. What did I do wrong?
Have you made sure that your computers BIOS is set to allow booting from USB devices?
I have come across the same problem with a Samsung NP300 series laptop, where if one installed windows, a BIOS option for "FastBoot" is enabled, and it blocks "Legacy USB Boot" the mode that allows booting linux from a USB device.
Just my 2 cents.
maybe you chose UEFI boot instead of BIOS. (haven't used LinuxLive)
do you have UEFI option in the BIOS menu? if you do, try to choose it and check if then it will boot.
another option is to create a virtual machine and check the usb in it - you can download virtualbox and see if the usb is bootable.