I have been setting up Geny Motion today to run with Android Studio, and was having difficulty setting up. Followed the instructions and installed Virtual Box v5.0, yet was still getting the error “Unable to load VirtualBox engine’.
For once Stack Overflow wasn’t very useful (omg), so got this fix off a colleague (http://www.codingtofu.com/) so thought it would be good to share further. And yes, you do have to sudo. Quick and simple:
sudo cp /usr/local/bin/VBoxManage /usr/bin/VBoxManage