Ubuntu 更换国内源方法

1.备份原始源文件
打开终端，输入备份命令及路径
sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak

2.编辑源文件
sudo vim /etc/apt/sources.list

3.删除源内容，将下面阿里源后者清华源地址复制进去并保存

#阿里源：
deb [http://mirrors.aliyun.com/ubuntu/](http://mirrors.aliyun.com/ubuntu/) bionic main restricted universe multiverse

deb [http://mirrors.aliyun.com/ubuntu/](http://mirrors.aliyun.com/ubuntu/) bionic-security main restricted universe multiverse

deb [http://mirrors.aliyun.com/ubuntu/](http://mirrors.aliyun.com/ubuntu/) bionic-updates main restricted universe multiverse

deb [http://mirrors.aliyun.com/ubuntu/](http://mirrors.aliyun.com/ubuntu/) bionic-proposed main restricted universe multiverse

deb [http://mirrors.aliyun.com/ubuntu/](http://mirrors.aliyun.com/ubuntu/) bionic-backports main restricted universe multiverse

deb-src [http://mirrors.aliyun.com/ubuntu/](http://mirrors.aliyun.com/ubuntu/) bionic main restricted universe multiverse

deb-src [http://mirrors.aliyun.com/ubuntu/](http://mirrors.aliyun.com/ubuntu/) bionic-security main restricted universe multiverse

deb-src [http://mirrors.aliyun.com/ubuntu/](http://mirrors.aliyun.com/ubuntu/) bionic-updates main restricted universe multiverse

deb-src [http://mirrors.aliyun.com/ubuntu/](http://mirrors.aliyun.com/ubuntu/) bionic-proposed main restricted universe multiverse

deb-src [http://mirrors.aliyun.com/ubuntu/](http://mirrors.aliyun.com/ubuntu/) bionic-backports main restricted universe multiverse

#清华源：
deb [https://mirrors.tuna.tsinghua.edu.cn/ubuntu/](https://mirrors.tuna.tsinghua.edu.cn/ubuntu/) bionic main restricted universe multiverse

deb-src [https://mirrors.tuna.tsinghua.edu.cn/ubuntu/](https://mirrors.tuna.tsinghua.edu.cn/ubuntu/) bionic main restricted universe multiverse

deb [https://mirrors.tuna.tsinghua.edu.cn/ubuntu/](https://mirrors.tuna.tsinghua.edu.cn/ubuntu/) bionic-updates main restricted universe multiverse

deb-src [https://mirrors.tuna.tsinghua.edu.cn/ubuntu/](https://mirrors.tuna.tsinghua.edu.cn/ubuntu/) bionic-updates main restricted universe multiverse

deb [https://mirrors.tuna.tsinghua.edu.cn/ubuntu/](https://mirrors.tuna.tsinghua.edu.cn/ubuntu/) bionic-backports main restricted universe multiverse

deb-src [https://mirrors.tuna.tsinghua.edu.cn/ubuntu/](https://mirrors.tuna.tsinghua.edu.cn/ubuntu/) bionic-backports main restricted universe multiverse

deb [https://mirrors.tuna.tsinghua.edu.cn/ubuntu/](https://mirrors.tuna.tsinghua.edu.cn/ubuntu/) bionic-security main restricted universe multiverse

deb-src [https://mirrors.tuna.tsinghua.edu.cn/ubuntu/](https://mirrors.tuna.tsinghua.edu.cn/ubuntu/) bionic-security main restricted universe multiverse

deb [https://mirrors.tuna.tsinghua.edu.cn/ubuntu/](https://mirrors.tuna.tsinghua.edu.cn/ubuntu/) bionic-proposed main restricted universe multiverse

deb-src [https://mirrors.tuna.tsinghua.edu.cn/ubuntu/](https://mirrors.tuna.tsinghua.edu.cn/ubuntu/) bionic-proposed main restricted universe multiverse

4.更新软件列表，终端执行以下命令：
sudo apt update