In the history of Windows, the Ctrl+Alt+Delete key combination has been used for different purposes, from instantly rebooting a system to logging into NT; in one incarnation it brought up the System Monitor, then later a logout screen with options (like the System Monitor).
In Ubuntu, that key combo is generally not in use, so you can assign it to whatever you want. While you could use it to logout or reboot, a good use for this combo is to assign it to Ubuntu’s System Monitor, so you can force misbehaving apps to quit, as well as check out RAM and CPU usage.
The simplest way to do this is go to System > Preferences > Keyboard Shortcuts, and add a new one. First, you may want to check that Logout (under the Desktop category) doesn’t already have that combo assigned to it (on some earlier versions of Ubuntu, that may be the case). Once you’re ready to proceed, click on one of the category names (I recommend Custom at the bottom) and click the +Add button. Then for Name put System Monitor, and for Command put gnome-system-monitor.
That’s it! The System Monitor should now open with that combo. If not, check out: What to do if Ctrl+Alt+Delete Does Not Open System Monitor.
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How do you accomplish this with Ubuntu 11.10 using Unity?
Are you saying that you couldn’t do it, or just that you don’t know how to access that app in Unity? If it’s the latter, just go to System Settings (click on your name top-right), click Keyboard, go to the Shortcuts tab, click on Custom Shortcuts, and add it there (by clicking the + button).
I couldn’t modify the keyboard shortcut (not that I didn’t know thst method) because I realized I had Compiz installed and I had to do it thru that interface.