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This question is pretty much a duplicate of this question. However I'm starting this question, because all the answers in the other question seem to focus on how to setup a custom shortcut for gnome-system-monitor, while the actual question is why does it not work?

That is I make a custom shortcut to launch gnome-system-monitor. I make sure that the System Log out is disabled (which is ctrl+alt+del by default). When I bind the gnome-system-monitor shortcut to anything else (say ctrl+alt+[), everything is fine and the system monitor starts.

But nothing happens when I assign it to Ctrl+Alt+Delete.

This is in Ubuntu 14.04 and I now this shortcut worked in previous versions.

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Try setting it using Compiz, after disabling it from System Settings → Keyboard → Shortcuts tab:

  1. Install ccsm

    sudo apt-get install compizconfig-settings-manager
    
  2. Run it and enable Commands plugin

  3. Set it the command in Commands tab & shortcut in Key Bindings tab

    compiz set command shortcut - 1

    compiz set command shortcut - 2

Actually, setting custom shortcut from System Setting works too for me. Custom shortcuts are handled by media-keys plugin from unity-settings-daemon try reinstall it:

sudo apt-get install --reinstall unity-settings-daemon
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  • Thanks, this works! do you have any thoughts on why this works, but setting it from keyboards settings does not? should I file a bug report or something?
    – Minos
    Jan 21, 2015 at 12:11
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    Actually, setting custom shortcut from System Setting works too for me. Custom shortcuts are handled by media-keys plugin from unity-settings-daemon try reinstall it sudo apt-get install --reinstall unity-settings-daemon
    – user.dz
    Jan 21, 2015 at 12:44
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    That's it! now it works by setting it in the keyboard system settings too.
    – Minos
    Jan 21, 2015 at 17:27

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