I want to make a bootable Linux image for a USB stick. For security reasons, I want to disable any other USB ports on the computer.
Is this possible? If so, how can I configure it? Let's assume I'm using Ubuntu 11.10.
In other words: I boot my computer from a USB stick. I want to make it impossible to use another stick at the same time.
Edit: The situation is hypothetical, in a discussion about using computers on exams. We are discussing whether students could bring their own computers, but run an OS from a USB stick handed out at the exam. This approach raises concerns about cheating, for example by bringing disallowed material on a USB stick, so I want to explore options to counter this cheating.