解决unable to locate package net-tools
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今天要在linux中执行ifconfig命令，命令无效，然后安装网络包，执行 sudo apt-get update和sudo apt install net-tools，报如下错误：unable to locate package net-tools，可以确定自己的源sources.list有问题，但是从网上找了很多的源，一直解决不了问题，最终找到下面的源解决了问题。
ubuntu版本：17.04
进入源：sudo vi sources.list，将下列内容替换sources.list中的内容，并保存
deb http://mirrors.aliyun.com/ubuntu/ trusty main multiverse restricted universe
deb http://mirrors.aliyun.com/ubuntu/ trusty-backports main multiverse restricted universe
deb http://mirrors.aliyun.com/ubuntu/ trusty-proposed main multiverse restricted universe
deb http://mirrors.aliyun.com/ubuntu/ trusty-security main multiverse restricted universe
deb http://mirrors.aliyun.com/ubuntu/ trusty-updates main multiverse restricted universe
deb-src http://mirrors.aliyun.com/ubuntu/ trusty main multiverse restricted universe
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-backports main multiverse restricted universe
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-proposed main multiverse restricted universe
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-security main multiverse restricted universe
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-updates main multiverse restricted universe
sources.list替换完后，重新执行sudo apt-get update和sudo apt install net-tools，然后就可以执行ifconfig了。完美解决！！！