title: Some VSCode Keybindings not working in Ubuntu
body: <p>I have just started with VSCode on Ubuntu and was looking for the equivalent of <code>cmd+shift+D</code> in Sublime on the Mac (duplicate selected text) . According to <a href="https://code.visualstudio.com/Docs/customization/keybindings" rel="noreferrer">the docs</a> I should use <code>Ctrl+Shift+Alt+Down</code> or <code>Ctrl+Shift+Alt+Up</code> but these keybindings are not working for me. When I look in <code>File &gt; Preferences &gt; Keyboard Shortcuts</code>, I see the definitions, but when I try to use them, nothing happens.</p>