I set up my computer to run the update overnight; my grandmother said it was making a lot of noise so she shut it off.
Trouble is, the upgrade didn't finish. Now, Xorg refuses to start; the computer boots to command line, and 'startx' returns that the X Window Server has encountered a segfault. I'll be able to post outputs from whatever later, but right now I'm not at home.
Also, would investing in biometrics for the computer room be worth it?