I mapped Ctrl-Alt-Up/Down to open web-browser 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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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.
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.
I know this thread is pretty old.
For me (Xubuntu 16.04, Xfce4) it helped to use
xfce4-settings-editor and then go to
xfce4-keyboard-shortcuts. Then scroll down to
xfwm4 and "Reset" the bindings for the relevant shortcuts.
In Ubuntu 18.04 Settings->Devices->keyboard in navigation search for shortcuts: super+up and super+down and change it, save in button define.