Suddenly, i lost all Geny motion emulators (maybe after upgrading to Geny motion 2.2, not sure) and when ever i download a new virtual machine or emulator i get the \"failed
So I upgraded to the latest version of Genymotion 2.6.0. Tried to install the new Virtual Devices and I got the same error. I tried to clear the cache as suggested above but it didn't help instead it removed the downloaded .ova file of the device and I had to download again.
I checked for update on VirtualBox and it shows that you're on the latest build. I checked the version and it showed 4.2.x. Checked the latest version on the site and damn... It was version 5.0 available on the website. Upgraded the VirtualBox to the latest 5.0 and here you go... Everything was back in place and my Genymotion Virtual Device was imported and is running fine.
So do check the versions of VirtualBox and see if it is the latest available on the website.