Get:40 http://mirrors.aliyun.com/ubuntu bionic-backports/main Sources [2569 B]
Get:41 http://mirrors.aliyun.com/ubuntu bionic-backports/universe Sources [2521 B]
Get:42 http://mirrors.aliyun.com/ubuntu bionic-backports/main amd64 Packages [2496 B]
Get:43 http://mirrors.aliyun.com/ubuntu bionic-backports/universe amd64 Packages [4227 B]
0% [Working]
出現這樣的狀況：
1/ 換源首先，然後運行
apt-get clean