armbian版本：ARMBIAN 5.44 user-built Ubuntu 18.04.2 LTS 3.14.29
deb https://mirrors.ustc.edu.cn/ubuntu-ports/ bionic main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-security main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-updates main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-backports main restricted universe multiverse