云服务器ubuntu20.04如何更换国内源

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ubuntu20.04更换国内源的方法。1.打开终端。2.输入以下命令备份原来的源。sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak3.再输入以下命令打开sources.list配置文件更换源。sudo vim/etc/apt/sources.list//配置内容如下deb http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiverse deb http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiverse deb-src http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse focal4.再输入命令更新源。sudo apt-get update5.最后输入命令更新一下软件即可。sudo apt-get upgrade