百度了很久，网上全是抄抄抄，特别是 CSDN ,要么卡，要么404，根本用不了。
将下面的源替换到 /etc/apt/source/list 即可

 deb http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic universe
 deb http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-updates universe
 deb http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic multiverse
 deb http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-updates multiverse
 deb http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-backports main restricted universe multiverse
 deb http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-security main restricted
 deb http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-security universe
 deb http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-security multiverse

突然发现，国内有华为arm64的镜像源！使用华为的镜像源速度十分快！
支持 ubuntu、华为鲲鹏服务器！
使用以下脚本即可自动替换为华为镜像源。

wget -O /etc/apt/sources.list https://repo.huaweicloud.com/repository/conf/Ubuntu-Ports-bionic.list
apt-get update

获取手动修改，将源地址改成

deb https://repo.huaweicloud.com/ubuntu-ports/ bionic main restricted universe multiverse
deb-src https://repo.huaweicloud.com/ubuntu-ports/ bionic main restricted universe multiverse

deb https://repo.huaweicloud.com/ubuntu-ports/ bionic-security main restricted universe multiverse
deb-src https://repo.huaweicloud.com/ubuntu-ports/ bionic-security main restricted universe multiverse

deb https://repo.huaweicloud.com/ubuntu-ports/ bionic-updates main restricted universe multiverse
deb-src https://repo.huaweicloud.com/ubuntu-ports/ bionic-updates main restricted universe multiverse

deb https://repo.huaweicloud.com/ubuntu-ports/ bionic-backports main restricted universe multiverse
deb-src https://repo.huaweicloud.com/ubuntu-ports/ bionic-backports main restricted universe multiverse

## Not recommended
# deb https://repo.huaweicloud.com/ubuntu-ports/ bionic-proposed main restricted universe multiverse