备份源列表sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak命令行打开sources.list文件sudo vim /etc/apt/sources.list修改sources.list文件sudo vim /etc/apt/sources.list将源文件内容全部注释，并添加以下内容任意源阿里云源 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 re
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