由于缺少 KVM，无法在 Ubuntu 上启动 PCF Dev（cf dev start）
Unable to start PCF Dev (cf dev start) on Ubuntu because of missing KVM
正在尝试在 Ubuntu 19.10 上启动 PCF Dev；失败并显示以下输出：
$ cf dev start
Downloading Resources...
Progress: |====================>| 100.0%
Setting State...
Error: argument "virbr0" is wrong: Device does not exist
Cannot find device "virbr0"
Creating the VM...
Starting the VM...
Fetching VM Address...
FAILED
cf dev start: exit status 1
原来需要安装KVM：
$ sudo apt-get install qemu-kvm libvirt-daemon-system libvirt-clients bridge-utils
正在尝试在 Ubuntu 19.10 上启动 PCF Dev；失败并显示以下输出：
$ cf dev start
Downloading Resources...
Progress: |====================>| 100.0%
Setting State...
Error: argument "virbr0" is wrong: Device does not exist
Cannot find device "virbr0"
Creating the VM...
Starting the VM...
Fetching VM Address...
FAILED
cf dev start: exit status 1
原来需要安装KVM：
$ sudo apt-get install qemu-kvm libvirt-daemon-system libvirt-clients bridge-utils