出现Failed to start Load Kernel Modules.基本上是跟安装了虚拟机有关，可能是虚拟机的内核版本和物理机不同造成的．

执行：

systemctl status systemd-modules-load.service

查看一下具体的问题．

然后具体步骤：

yum install kmod-VirtualBox-$(uname -r) kmod-VirtualBox

yum install kmod-VirtualBox-$(uname -r) kmod-VirtualBox  --enablerepo=rpmfusion-free-updates-testing

systemctl restart systemd-modules-load.service　／／重新启动kernel moduels

systemctl status systemd-modules-load.service //看看错误还在没

Install the akmod-VirtualBox package and the kernel headers:

# dnf install akmod-VirtualBox kernel-devel

You may uninstall the kmod packages because you don't need them anymore (and it might not work with them installed):

# dnf remove kmod-VirtualBox-*

Either reboot or start the build process manually

# akmods

You may have to unload the old kernel modules (those could still be loaded after a VirtualBox upgrade):

# rmmod vboxnetadp vboxnetflt vboxdrv

If everything is working now, restarting the modules service should not print any error message:

# systemctl restart systemd-modules-load