方法:
- 打开 /etc/apt/sources.list
- 在原先的源前面加#号注释掉，并将国内源复制过去
- apt-get update
国内源:
已自测/此源用于ARM_Ubuntu_bionic
用于机顶盒armbian_ubuntu_bionic
deb http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-updates main restricted universe multiverse
deb http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-security main restricted universe multiverse
deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-security main restricted universe multiverse
deb http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-backports main restricted universe multiverse
deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-backports main restricted universe multiverse
deb http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic main universe restricted
deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic main universe restricted
#deb http://ports.ubuntu.com/ bionic main restricted universe multiverse
#deb-src http://ports.ubuntu.com/ bionic main restricted universe multiverse
#deb http://ports.ubuntu.com/ bionic-updates main restricted universe multiverse
#deb-src http://ports.ubuntu.com/ bionic-updates main restricted universe multiverse
#deb http://ports.ubuntu.com/ bionic-security main restricted universe multiverse
#deb-src http://ports.ubuntu.com/ bionic-security main restricted universe multiverse
#deb http://ports.ubuntu.com/ bionic-backports main restricted universe multiverse
#deb-src http://ports.ubuntu.com/ bionic-backports main restricted universe multiverse
#deb http://ports.ubuntu.com/ubuntu-ports/ bionic main universe restricted
#deb-src http://ports.ubuntu.com/ubuntu-ports/ bionic main universe restricted #Added by software-properties
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic-updates main restricted universe multiverse
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic-security main restricted universe multiverse
deb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic-security main restricted universe multiverse
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic-backports main restricted universe multiverse
deb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic-backports main restricted universe multiverse
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic main universe restricted
deb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic main universe restricted
2.
换源（仅仅针对ubuntu系统）
deb [ arch=arm64,armhf ] https://mirrors.tuna.tsinghua.edu.cn/debian/ stretch main contrib non-free
#deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ stretch main contrib non-free
deb [ arch=arm64,armhf ] https://mirrors.tuna.tsinghua.edu.cn/debian/ stretch-updates main contrib non-free
#deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ stretch-updates main contrib non-free
deb [ arch=arm64,armhf ] https://mirrors.tuna.tsinghua.edu.cn/debian/ stretch-backports main contrib non-free
#deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ stretch-backports main contrib non-free
deb [ arch=arm64,armhf ] https://mirrors.tuna.tsinghua.edu.cn/debian-security/ stretch/updates main contrib non-free
#deb-src https://mirrors.tuna.tsinghua.edu.cn/debian-security/ stretch/updates main contrib non-free
debian的stretch版本，其他版本自行修改
deb https://mirrors.tuna.tsinghua.edu.cn/debian/ stretch main contrib non-free
# deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ stretch main contrib non-free
deb https://mirrors.tuna.tsinghua.edu.cn/debian/ stretch-updates main contrib non-free
# deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ stretch-updates main contrib non-free
deb https://mirrors.tuna.tsinghua.edu.cn/debian/ stretch-backports main contrib non-free
# deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ stretch-backports main contrib non-free
deb https://mirrors.tuna.tsinghua.edu.cn/debian-security stretch/updates main contrib non-free
# deb-src https://mirrors.tuna.tsinghua.edu.cn/debian-security stretch/updates main contrib non-free
ubuntu的bionic版本，其他版本自行修改
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic main restricted universe multiverse
#deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic-updates main restricted universe multiverse
#deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic-backports main restricted universe multiverse
#deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic-backports main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic-security main restricted universe multiverse
#deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic-security main restricted universe multiverse
更换软件apt源
原文：https://www.cnblogs.com/htybky/p/11443430.html
