I have been using ubuntu for a month and everything is just fine. However, when I try to open my ubuntu today, it suddenly shows nothing but my wallpaper after login, no menu or launcher. And it shows a message that vboxclient the virtualbox kernel service is not running, exiting. And whatever I type in terminal, it just says sudo: unable to resolve host, connection refuesd. My ubuntu version is 16.04. Any idea what can be wrong?
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