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I mapped Ctrl-Alt-Up/Down to open webbrowser and email client but it didn't take effect. Ctrl-Alt-Up/Down still switch workspaces as the default setting of Gnome 3.8.

I have tried log-out/log-in. No good.

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up vote 12 down vote accepted

The new keybinding you define in 'Settings-->Keyboard-->Shortcuts-->Navigation' will get appended to the previous/default one.

It will become, for example.

gsettings get org.gnome.desktop.wm.keybindings switch-to-workspace-down

['<Primary><Shift>Down', '<Control><Alt>Down']

I managed to remove the default keybinding using the following commands

gsettings set org.gnome.desktop.wm.keybindings switch-to-workspace-down "['']"
gsettings set org.gnome.desktop.wm.keybindings switch-to-workspace-up "['']"

This clears all defined shortcuts for those tasks. And then just use 'Settings-->Keyboard-->Shortcuts-->Navigation' to define the desired shortcuts.

Source : https://bugzilla.redhat.com/show_bug.cgi?id=982695

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Didn't work for me on Ubuntu 12.04. I.e. used the above gsettings commands, restarted and still ctrl-alt-down/up will switch workspaces. – kris Jan 2 '15 at 17:20
    
The window docking can be fixed via the CompizConfig Settings Manager. See askubuntu.com/questions/305092/… – geneorama Mar 19 '15 at 6:34
1  
Worked on Ubuntu 15.04. :) – Angelorf Jun 22 '15 at 7:55
    
From all possible methods for removing gnome bindings, this is one is the most reliable one IMO. Worked for me on Fedora 23 - Gnome Shell 3.18... Thank you... – onreachable Mar 30 at 6:38
    
Worked on Ubuntu Gnome 15.10 – Paulo Pedroso Apr 4 at 16:56

This worked for me on Ubuntu 12.04

Go to "System Settings -> Keyboard -> Shortcuts -> Navigation".

Find the workspace switching shortcuts bound to CTRL-ALT-ARROW. For each one of them do this:

Click on shortcut (so it says "New Accelarator..." allowing you to change the shortcut). Now Press 'Backspace' to clear it. It now says 'Disabled' for that shortcut.

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Do I need to restart for the changes to be applied? – Angelorf Jun 19 '15 at 11:45
    
It's been a long time ago I disabled this. I'm sorry I can't remember if worked 'instantly' or not. – kris Jun 19 '15 at 20:49
    
Restart didn't do the trick. The settings are back to normal and changing them never had any effect. – Angelorf Jun 22 '15 at 7:52
    
The answer by @mac did the trick. The post also has a link to a site explaining the bug I experienced. – Angelorf Jun 22 '15 at 7:55

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