環境: Ubuntu
Genymotionを起動すると以下のようなエラーが出るとき
Unable to load VirtualBox engine.
Make sure that you have installed it correctly before starting Genymotion.
For more information refer to: https://cloud.genymotion.com/page/faq/#vbox
次のコマンドで解決できた
sudo /etc/init.d/vboxdrv setup