1. 执行chmod命令更改文件权限使软件源文件可编辑:
sudo chmod 777 /etc/apt/sources.list
2. 使用vi 编辑器
vi /etc/apt/sources.list
进入后按i进入编辑模式(即INSERT插入),编辑完后先按Esc退出编辑模式,然后输入 :wq 退出即可。
3. 输入镜像源
阿里云的源
deb http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiverse
deb-src http://mi

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