Ubuntu换源
使用vi备份默认源，防止以后换回默认源 cp /etc/apt/sources.list /etc/apt/sources.list.bak 使用vi打开源文件 vi /etc/apt/sources.list 进入后先按字母a进入输入模式，然后一行一行的更改
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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
使用vim进行替换
命令 vim /etc/apt/sources.list 和vi一样需要先进入编辑才能进行更改
使用gedit命令
推荐在可视化界面使用该命令 gedit /etc/apt/sources.list 使用gedit打开的文件会像Windows中的txt文件一样，可以使用Windows操作的任意方法进行操作
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