通常情况下阿里云的镜像源(http://mirrors.aliyun.com/ubuntu/)用得比较多
但是也不排除因网络环境导致的某个镜像源访问慢问题
那么就可以配置为自动选择镜像源进行更新
修改 /etc/apt/sources.list 内容
以18.04为例
deb mirror://mirrors.ubuntu.com/mirrors.txt bionic main restricted universe multiverse deb mirror://mirrors.ubuntu.com/mirrors.txt bionic-backports main restricted universe multiverse deb mirror://mirrors.ubuntu.com/mirrors.txt bionic-proposed main restricted universe multiverse deb mirror://mirrors.ubuntu.com/mirrors.txt bionic-security main restricted universe multiverse deb mirror://mirrors.ubuntu.com/mirrors.txt bionic-updates main restricted universe multiverse deb-src mirror://mirrors.ubuntu.com/mirrors.txt bionic main restricted universe multiverse deb-src mirror://mirrors.ubuntu.com/mirrors.txt bionic-backports main restricted universe multiverse deb-src mirror://mirrors.ubuntu.com/mirrors.txt bionic-proposed main restricted universe multiverse deb-src mirror://mirrors.ubuntu.com/mirrors.txt bionic-security main restricted universe multiverse deb-src mirror://mirrors.ubuntu.com/mirrors.txt bionic-updates main restricted universe multiverse
划重点
mirror://mirrors.ubuntu.com/mirrors.txt
