Ubuntu 16.04 LTS 无法安装vim 解决

最近在学习ROS，想用vim 编辑一个文件，却遇到了下图所示的情况。

刚开始照网上说的，在终端输入这两句

 sudo apt-get update

 sudo apt-get install vim

结果出现下图

后来我觉得应该是源的问题，刚遇到这个问题之时，有把源给换了，不过之前安装后的源也是不行的，接下来在终端输入

sudo gedit /etc/apt/sources.list   

这次会打开这个sources.list,在这里修改源，我之前用的是网易的，我觉得应该是网易的云有问题，导致我不能正常安装vim,然后换了阿里云的源。

阿里云源

# deb cdrom:[Ubuntu 16.04 LTS _Xenial Xerus_ - Release amd64 (20160420.1)]/ xenial main restricted
deb-src http://archive.ubuntu.com/ubuntu xenial main restricted #Added by software-properties
deb http://mirrors.aliyun.com/ubuntu/ xenial main restricted
deb-src http://mirrors.aliyun.com/ubuntu/ xenial main restricted multiverse universe #Added by software-properties
deb http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted multiverse universe #Added by software-properties
deb http://mirrors.aliyun.com/ubuntu/ xenial universe
deb http://mirrors.aliyun.com/ubuntu/ xenial-updates universe
deb http://mirrors.aliyun.com/ubuntu/ xenial multiverse
deb http://mirrors.aliyun.com/ubuntu/ xenial-updates multiverse
deb http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse #Added by software-properties
deb http://archive.canonical.com/ubuntu xenial partner
deb-src http://archive.canonical.com/ubuntu xenial partner
deb http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted multiverse universe #Added by software-properties
deb http://mirrors.aliyun.com/ubuntu/ xenial-security universe
deb http://mirrors.aliyun.com/ubuntu/ xenial-security multiverse

即把这段替代刚打开那个文件，然后保存关闭，在终端输入

 sudo apt-get update

 sudo apt-get install vim

然后可以安装vim了，现在编辑一个a.c文件,图如下，可以正常使用了。