本文记录了在Ubuntu系统中，用户切换软件源的过程。通过使用root权限编辑sources.list文件，替换了默认的Ubuntu官方软件源为阿里云提供的镜像站点。这有助于提高在安装和更新软件包时的速度与稳定性。
heihouzi@ubuntu100:~$ su - root
passwd ******
root@ubuntu100:~# cd /etc/apt/
root@ubuntu100:/etc/apt# cp sources.list sources.list.bb
root@ubuntu100:/etc/apt# vi sources.list
deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
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