在虚拟机中新安装的Ubuntu16.04默认连不上网的，导致基础类库软件无法更新，而且putty、FileZilla等工具也无法连接Ubuntu。
一、首先要设置宿主机器的网络
设置本地连接与虚拟网络VMnet8共享
设置虚拟网络VMnet8
二、安装好的虚拟机网络调整为NAT模式。进入Ubuntu系统查看网卡名称，然后调整网络配置。
查看网卡名称：ifconfig
由于默认vi编辑器有问题，比如上下左右变成ABCD，此问题下面会解决。所以暂时用gedit命令调整网络配置，
配置DNS服务器，
重启网络服务
测试网络是否可用
三、源调整
查看ubuntu系统的codename
备份源
修改源
1 #xenial指codename，请根据实际情况调整 2 #163源： 3 deb http://mirrors.163.com/ubuntu/ xenial main restricted universe multiverse 4 deb http://mirrors.163.com/ubuntu/ xenial-security main restricted universe multiverse 5 deb http://mirrors.163.com/ubuntu/ xenial-updates main restricted universe multiverse 6 deb http://mirrors.163.com/ubuntu/ xenial-proposed main restricted universe multiverse 7 deb http://mirrors.163.com/ubuntu/ xenial-backports main restricted universe multiverse 8 deb-src http://mirrors.163.com/ubuntu/ xenial main restricted universe multiverse 9 deb-src http://mirrors.163.com/ubuntu/ xenial-security main restricted universe multiverse 10 deb-src http://mirrors.163.com/ubuntu/ xenial-updates main restricted universe multiverse 11 deb-src http://mirrors.163.com/ubuntu/ xenial-proposed main restricted universe multiverse 12 deb-src http://mirrors.163.com/ubuntu/ xenial-backports main restricted universe multiverse 13 14 #阿里源： 15 deb http://mirrors.aliyun.com/ubuntu/ xenial main restricted universe multiverse 16 deb http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted universe multiverse 17 deb http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted universe multiverse 18 deb http://mirrors.aliyun.com/ubuntu/ xenial-proposed main restricted universe multiverse 19 deb http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse 20 deb-src http://mirrors.aliyun.com/ubuntu/ xenial main restricted universe multiverse 21 deb-src http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted universe multiverse 22 deb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted universe multiverse 23 deb-src http://mirrors.aliyun.com/ubuntu/ xenial-proposed main restricted universe multiverse 24 deb-src http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse 25 26 #中科大源（在安装Chrome Deps时很好用） 27 deb http://mirrors.ustc.edu.cn/ubuntu/ xenial main restricted universe multiverse 28 deb http://mirrors.ustc.edu.cn/ubuntu/ xenial-security main restricted universe multiverse 29 deb http://mirrors.ustc.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse 30 deb http://mirrors.ustc.edu.cn/ubuntu/ xenial-proposed main restricted universe multiverse 31 deb http://mirrors.ustc.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse 32 deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial main restricted universe multiverse 33 deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial-security main restricted universe multiverse 34 deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse 35 deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial-proposed main restricted universe multiverse 36 deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse
如果上面的源有问题就用简洁版本
1 deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial main restricted universe multiverse 2 # deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial main restricted universe multiverse 3 deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse 4 # deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse 5 deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse 6 # deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse 7 deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-security main restricted universe multiverse 8 # deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-security main restricted universe multiverse
最后update
四、上下左右变成ABCD问题，卸载vi重新安装即可
五、安装ssh服务，方便使用putty远程登录Ubuntu
