解决方案

1.更新源

如果出现报错：

Some index files failed to download, they have been ignored, or old ones used instead.”

只需要更改一下sources.list文件即可，如下

添加文件内容
deb http://www.landui.com/ubuntu/ xenial main restricted universe multiverse

deb http://www.landui.com/ubuntu/ xenial-security main restricted universe multiverse

deb http://www.landui.com/ubuntu/ xenial-updates main restricted universe multiverse

deb http://www.landui.com/ubuntu/ xenial-proposed main restricted universe multiverse

deb http://www.landui.com/ubuntu/ xenial-backports main restricted universe multiverse

deb-src http://www.landui.com/ubuntu/ xenial main restricted universe multiverse

deb-src http://www.landui.com/ubuntu/ xenial-security main restricted universe multiverse

deb-src http://www.landui.com/ubuntu/ xenial-updates main restricted universe multiverse

deb-src http://www.landui.com/ubuntu/ xenial-proposed main restricted universe multiverse

deb-src http://www.landui.com/ubuntu/ xenial-backports main restricted universe multiverse

2.安装vim

接下来就可以用vim了。