Update: Before you read further, I want to notice that I didn't have any problems since I upgraded VirtualBox to 4.3.4. I use VirtualBox 4.3.2 under Ubuntu 13.10. I had same issue after upgrading from Genymotion 2.0.0 to 2.0.1. These are the steps I followed to fix this, although I'm not sure which one works for you. Step 1. Start VirtualBox, go to menu File/Preferences menu, go to Network section
![GenyMotion Unable to start the Genymotion virtual device](https://cdn-ak-scissors.b.st-hatena.com/image/square/98d6f053a97a87156775f60757c60865d0f2c47d/height=288;version=1;width=512/https%3A%2F%2Fcdn.sstatic.net%2FSites%2Fstackoverflow%2FImg%2Fapple-touch-icon%402.png%3Fv%3D73d79a89bded)