Josh Holland:How have you not heard? Ctrl-Alt-Bksp is being disabled to prevent newbies exploring restarting their X servers. There was quite a discussion in ubuntu-devel-discuss.
Dotan Cohen:Are there any documented cases where a newbie has been bitten by this?
David Curtis:Yes, I was just on IRC #ubuntu when someone asked how to restart alsa/pulseaudio. Some idiot responded 'hit ctrl-alt-bksp' and boom, newb at xxx.xxx.xx.xx. has quit (client terminated).
Laughable, yes. But if the questioner had lost data they would have been furious.