【汇总】Ubuntu更新源、换源

1. 备份系统源：

cd /etc/apt sudo mv sources.list sources.list_bak sudo mv /etc/apt/sources.list /etc/apt/sources.list_bak

2. 添加新的源文件：

sudo vi sources.list sudo vi /etc/apt/sources.list

并添加以下内容：注意，每一行的trusty应该用第一步查看得到的Codename来代替（http://www.cnblogs.com/lyon2014/p/4715379.html）

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其他源（https://zhuanlan.zhihu.com/p/61228593）

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3. 保存并且sudo apt-get update，更新成功