davideotape is correct. It's not a bug it's feature (really, it is).
You can add
Section "ServerFlags"
Option "DontZap" "false"
EndSection
to xorg.conf if you want it disabled.
** Changed in: ubuntu
Status: New => Invalid
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[Jaunty alpha3]X can't reboot by key combination "Alt-Ctrl-Backspace"
https://bugs.launchpad.net/bugs/326062
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