修改Ubuntu的aptget源为阿里源的方法

 1、复制原文件备份

sudo cp /etc/apt/source.list /etc/apt/source.list.bak

2、编辑源列表文件

sudo vim /etc/apt/source.list

3、将原来的列表删除，添加如下内容

deb http://mirrors.aliyun.com/ubuntu/ vivid main restricteduniverse multiverse
deb http://mirrors.aliyun.com/ubuntu/ vivid-security mainrestricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ vivid-updates main restricteduniverse multiverse
deb http://mirrors.aliyun.com/ubuntu/ vivid-proposed mainrestricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ vivid-backports mainrestricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ vivid main restricteduniverse multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ vivid-security mainrestricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ vivid-updates mainrestricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ vivid-proposed mainrestricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ vivid-backports mainrestricted universe multiverse

备注：vivid 为系统的版本关键字Codename，修改为自己系统相对应的，

如果不知道Codename也没关系，只要在Ubuntu命令行中输入命令“lsb_release-a”，即可显示其Codename。如下，trusty即为14.04的Codename。

# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 14.04LTS
Release:    14.04
Codename:  trusty

4、运行

sudo apt-get update

5、运行

sudo apt-get upgrade