|Someone wrote in mjg59,|
This is really about losing the ability to modify both the hardware and the software -- in other words, you cannot use your own PC in a way you want. People who say "there will be Linux/Ubuntu keys" forget that they most likely won't be able to compile their own bootloader and/or kernel and sign them.
Instead of punishing those who abuse PCs for cyber crime they want to make sure that it is impossible to commit it. If they used the same principles in real life, firing a weapon would require a signed key for every bullet.