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Since Ubuntu 9.04, the Ctrl-Alt-Backspace key combination to force a restart of X is now disabled by default, to eliminate the problem of accidentally triggering the key combination. In addition, the Ctrl-Alt-Backspace option is now configured as an X keymap (XKB) option, replacing the X server "DontZap" option and allowing per-user configuration of this setting.
Current default for X servers as shipped in various distributions is to not enable the traditional Ctrl-Alt-Backspace key combination to kill the X server. If you would like to re-enable this feature, you may do so in your desktop's Keyboard Preferences application.
Ctrl+Alt+Backspace (i.e. the shortcut which was used to restart the X server) has to be enabled in a different way with respect to previous releases of Ubuntu.
This is due to the fact that “DontZap” is no longer an option in the X server and has become an option in XKB instead.
One of the many changes in xserver 1.6 is switching the DontZap option's default so that the ctrl-alt-backspace option does not trigger X to terminate unless the user deliberately configures it to do so.
Latest release of Ubuntu 9.04 codenamed Jaunty Jackalope has few annoyances for experienced users such as Indicator applet, No default Compiz/desktop effects for some Intel based motherboards, Update manager nagging continuously for updates, cant restart X server by Ctrl+Alt+Backspace key combination etc. This article will enlist the fixes or workarounds for these annoyances.