Fedora 20升级内核后VirtualBox不能正常使用的问题

 升级内核后，重启机器再次运行VirtualBox，  启动虚拟机会提示如下内容：

Kernel driver not installed (rc=-1908)    
TheVirtualBoxLinux kernel driver (vboxdrv)is probably not loaded.    
If you installed orVirtualBoxpackage recently you need to restart the computer for the driver to load.    
Alternatively, you may attempt to load the driver by issuing the following command with system administrator (root) privileges:    
'/etc/sysconfig/modules/VirtualBox.modules'

按照提示在root权限下运行
/etc/sysconfig/modules/VirtualBox.modules
却提示如下：

ERROR: modinfo: could not find module vboxdrv
ERROR: modinfo: could not find module vboxnetflt
ERROR: modinfo: could not find module vboxnetadp

解决方法如下：(来源于网络）
  yum  install kmod-VirtualBox
然后
/etc/sysconfig/modules/VirtualBox.modules