最近自己裝了個ubuntu kylin 在使用的過程中發現，系統的apt-get 的源有毛病，總是安裝不了軟件。
感覺應該是傳說中的牆的原因，所以准備換到阿里雲的源。
下面是步驟：
1、復制原文件備份
sudo cp /etc/apt/source.list /etc/apt/source.list.bak
2、編輯源列表文件
sudo vim /etc/apt/source.list
3、將原來的列表刪除，添加如下內容
deb http://mirrors.aliyun.com/ubuntu/ vivid main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ vivid-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ vivid-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ vivid-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ vivid-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ vivid main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ vivid-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ vivid-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ vivid-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ vivid-backports main restricted universe multiverse
4、運行sudo apt-get update
5、運行sudo apt-get upgrade
以上就完成了對源的更換。