Virtualbox does not run: NS_ERROR_FAILURE
Solution 1:
The most simple decision, that i found:
- enter into the folder
/home/$user/.VirtualBox/ - find there file
VirtualBox.xml-prev, this is backed up the configurations of Virtual Box - delete
VirtualBox.xml - and change name
VirtualBox.xml-prevtoVirtualBox.xml.
Solution 2:
Probably due to some updates. It happened to me. A simple command can fix the problem:
sudo /etc/init.d/vboxdrv setup