KVM虚拟机的通用问题，307安装KVM搞不定桥接。

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现在好像网络配置改成netplan.io没有/etc/network/interfaces这个配置文件了，直接307安装kvm虚拟机会搞不定桥接。

308安装PVE
find: ‘/var/lib/dhcp/’: No such file or directory
Creating /etc/network/interfaces.
Reloading network config on first install
error: Another instance of this program is already running.