ubuntu 改 apt-get 为阿里源

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1.在图形界面下

step1. 打开software&updates

step2. 在download from 选项卡中找到China中的
   http://mirrors.aliyun.com/ubuntu

step3. 保存后 在terminal中输入:apt-get update (更新软件列表)

2.在终端下

step1. 复制源文件备份
   sudo cp /etc/apt/source.list /etc/apt/source.list.bak

step2. 编辑源列表文件
    sudo vim /etc/apt/source.list
    进入文件
    将文件内容改为

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to# newer versions of the distribution.deb http://mirrors.aliyun.com/ubuntu/ xenial main restricted# deb-src http://us.archive.ubuntu.com/ubuntu/ xenial main restricted## Major bug fix updates produced after the final release of the## distribution.deb http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted# deb-src http://us.archive.ubuntu.com/ubuntu/ xenial-updates main restricted## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu## team. Also, please note that software in universe WILL NOT receive any## review or updates from the Ubuntu security team.deb http://mirrors.aliyun.com/ubuntu/ xenial universe# deb-src http://us.archive.ubuntu.com/ubuntu/ xenial universedeb http://mirrors.aliyun.com/ubuntu/ xenial-updates universe# deb-src http://us.archive.ubuntu.com/ubuntu/ xenial-updates universe## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu ## team, and may not be under a free licence. Please satisfy yourself as to ## your rights to use the software. Also, please note that software in ## multiverse WILL NOT receive any review or updates from the Ubuntu## security team.deb http://mirrors.aliyun.com/ubuntu/ xenial multiverse# deb-src http://us.archive.ubuntu.com/ubuntu/ xenial multiversedeb http://mirrors.aliyun.com/ubuntu/ xenial-updates multiverse# deb-src http://us.archive.ubuntu.com/ubuntu/ xenial-updates multiverse## N.B. software from this repository may not have been tested as## extensively as that contained in the main release, although it includes## newer versions of some applications which may provide useful features.## Also, please note that software in backports WILL NOT receive any review## or updates from the Ubuntu security team.deb http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse# deb-src http://us.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse## Uncomment the following two lines to add software from Canonical's## 'partner' repository.## This software is not part of Ubuntu, but is offered by Canonical and the## respective vendors as a service to Ubuntu users.# deb http://archive.canonical.com/ubuntu xenial partner# deb-src http://archive.canonical.com/ubuntu xenial partnerdeb http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted# deb-src http://security.ubuntu.com/ubuntu xenial-security main restricteddeb http://mirrors.aliyun.com/ubuntu/ xenial-security universe# deb-src http://security.ubuntu.com/ubuntu xenial-security universedeb http://mirrors.aliyun.com/ubuntu/ xenial-security multiverse# deb-src http://security.ubuntu.com/ubuntu xenial-security multiverse

step.3 输入 :wq
    保存文件

step.4 更新软件列表
   apt-get update