Ubuntu.Debian软件源

更换软件源：

一、设置时区：

ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime && echo "Asia/Shanghai" > /etc/timezone

二、用 vim 或 WinSCP 编辑 /etc/apt/sources.list

Ubuntu

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-security main restricted universe multiverse 

#deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic-security 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

Debian

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

#deb [ arch=arm64,armhf ] https://mirrors.tuna.tsinghua.edu.cn/debian/ sid main contrib non-free

最后执行：

apt-get update && apt-get upgrade