After a reboot, I started getting a VERR_SUPDRV_COMPONENT_NOT_FOUND error when trying to start a VM in VirtualBox. This error is related to VirtualBox’s usage of the vboxnetflt driver. I found that this was caused by the fact that I had updated my Linux kernel, but VirtualBox was not aware of the change. The fix is as follows:

1. Open a Terminal session.
2. Issue the following command:

   sudo /etc/init.d/vboxdrv setup

This will re-compile the VirtualBox kernel module, and everything should start working again.