用java几年，最近想了解一下Python，打算安装Ubuntu系统，Ubuntu系统安装难免遇到一些问题，再次罗列
问题：Ubuntu系统安装，前部分有部分文件和命令的下载，如果不使用国内镜像文件，下载速度非常慢，这时就需要考虑更换镜像（推荐阿里的镜像）
补充（虚拟机用vm virtualbox ）
镜像文件修改路径：vim /etc/apt/sources.list ， 如果更改之前需要做保存，可以用cp /etc/apt/sources.list /etc/apt/sources.back
后添加阿里镜像：
deb http://mirrors.aliyun.com/ubuntu/ trusty main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ trusty-security main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ trusty-updates main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ trusty-proposed main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ trusty-backports main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ trusty main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ trusty-security main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ trusty-updates main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ trusty-proposed main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ trusty-backports main restricted universe multiverse