title: Shortcut for Copy/Paste not work in VSCode
body: <p>Now I'm using the latest Visual Studio Code on Ubuntu 20.04 and face the problem with the Copy/Paste shortcut. When I use Ctrl+C, it is not Copy the chosen code to the clipboard, it has been changed to Insert mode instead. And I even not be able to use Ctrl+X and Ctrl+V.
  I have tried to reinstall the program but the problem still there. With other IDE, it still works normally.
  So, please help to fix this problem!</p>