One of the things I really love about GNU/Linux is the power I have to customize things in the system to my liking. Rather than force changes down your throat like the other operating systems out there, GNU/Linux gives you the power to choose!! You have the power!!
Usually, after installing the base system, I come back and tweak things a bit to my liking. After all, per the license - I already own this copy of Ubuntu GNU/Linux that's installed on my computer, so I might as well customize it to my liking as much or as little as I like!! This is what Freedom in computing is all about!!
Of course, the developers behind Ubuntu, have made it so I don't need to customize anything at all if I don't want to, and it's still a very easy to use this awesome Ubuntu GNU/Linux anyway!! But when I do want to customize, I can do this as little or as much "tweaking" as my geek appetite calls for.
Something I always customize in my Ubuntu GNU/Linux, is having Control+Alt+Backspace "kill the session". This makes it easy to jump out of my logged in session if I've launched something that failed or otherwise screwed things up so I can't operate in the current session.
In Ubuntu 13.04, the aforementioned option was a few short steps to being enabled. It was done by clicking the gear menu by the clock, then System>Preferences>Keyboard, then on the Layouts tab, then clicking Layout options, then under "Key sequence to kill the X server", putting a check by "Ctrl+Alt+Backspace".
In Ubuntu 13.10, it seems the option has been moved around again, because they've polished up the menus a bit more. But, unlike some other systems out there that don't let you easily change things around, in this Ubuntu GNU/Linux - we can still change this setting(and much more) rather easily. So here's how I enabled "Use Control+Alt+Backspace to terminate the X server?":
1.) Hit Control+Alt+t to launch the terminal
2.) Type or paste in the command below into the terminal, hit enter, then authenticate with your user password necessary (below is a one liner):
sudo dpkg-reconfigure keyboard-configuration
3.) Hit enter 5 times, or as necessary, to accept the already-set values for the keyboard settings and arrive at the screen to change the behavior for "Control+Alt+Backspace" (see picture above).
4.) At the screen that says, "Use Control+Alt+Backspace to terminate the X server?", hit the left arrow key to select yes, then hit Enter to save the setting and complete the kbd configuration.
Voila! At this point, if you hit Control+Alt+Backspace, you will be exited from your current session! Just make sure you save any open work before testing this out, as it will not save anything automatically.
User Customizations - Another reason to love GNU/Linux!! Get Yours!!