通常情況下阿里雲的鏡像源(http://mirrors.aliyun.com/ubuntu/)用得比較多
但是也不排除因網絡環境導致的某個鏡像源訪問慢問題
那么就可以配置為自動選擇鏡像源進行更新
修改 /etc/apt/sources.list 內容
以18.04為例
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
划重點
mirror://mirrors.ubuntu.com/mirrors.txt