====== Ubuntu - Keyboard - Disable Alt+F4 for window closing ======

<code bash>
gsettings set org.gnome.desktop.wm.keybindings close ''
</code>

----

To change it from F4 to F9.

<code bash>
gsettings set org.gnome.desktop.wm.keybindings close "[‘<Alt>F9’]"
</code>