virtualbox-4.0使用中，需要额外安装Oracle VM VirtualBox Extension Pack

尽早打开VBOX的时候看到升级提示，然后下载了 VirtualBox-4.0-4.0.10_72479_fedora14-1.i686.rpm包，安装的时候提示



Failed to initialize packaging backend.
This may occur if other packaging tools are being used simultaneously.

sudo安装也无效


本人系统是fedora

看提示啊。