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需要下载ncnn源码，需要明确ping www.baidu.com 通不通，如果不通，则
修改/etc/resolv.conf
Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
#nameserver 192.168.93.2
#nameserver 127.0.1.1
#search localdomain
nameserver 8.8.8.8
nameserver 114.114.114.114
重启网络
/etc/init.d/networking restart
/sbin/dhclient
此时，网络已经通了，但是git clone https://github.com/Tencent/ncnn.git时，出现：
fatal: unable to access 'https://github.com/Tencent/ncnn.git/': Operation timed out after 0 milliseconds with 0 out of 0 bytes received
则取消代理：
git config --global --unset http.proxy
git config --global --unset https.proxy
git clone https://github.com/Tencent/ncnn.git
root@ubuntu-virtual-machine:/home/ncnn# mkdir build
root@ubuntu-virtual-machine:/home/ncnn# cd build
root@ubuntu-virtual-machine:/home/ncnn/build# cmake -DNCNN_VULKAN=OFF ..
编译ncnn情况如下图所示：
make install安装ncnn
