I'm using Oracle Virtualbox 5.1.22 with Ubuntu 14.04.5. All was well until I installed the Virtualbox extension pack (not the guest package). I installed the correct pack for the Virtualbox I'm running (5.1.22 r115126). Now when I open Virtualbox, everything is fine. When I power on Ubuntu, I lose the mouse immediately. It's totally invisible but it's there because when I physically move my mouse around I can see things being affected, but it's invisible inside and outside Ubuntu. I have no option but to press the power button on my computer to shut down. Dead in the water.
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