Remove "vboxclient the virtualbox kernel service is not running. exiting" popup

If you want to remove this popup at the startup, you can modify /etc/X11/Xsession.d/98vboxadd-xclient and replace the message in notify-send by an echo.
The otherwise is removing the file.
sudo rm /etc/X11/Xsession.d/98vboxadd-xclient

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