N1 brushes armbian to update apt, some sources lack a lot of things, especially the source of Ali Huawei, but the arm architecture is much less, so be careful to change the source! ! !
nano /etc/apt/sources.list
Ctrl+X
Y
Enter
deb http://mirrors.ustc.edu.cn/debian stretch main contrib non-free
deb http://mirrors.ustc.edu.cn/debian stretch-updates main contrib non-free
deb http://mirrors.ustc.edu.cn/debian stretch-backports main contrib non-free
deb http://mirrors.ustc.edu.cn/debian-security/ stretch/updates main contrib non-free
apt-get update