申请的华为云Debian系统apt-get update失败，只能手动更换Debian/Ubuntu16默认的apt-get源。
步骤如下：
1.备份系统自带源
mv /etc/apt/sources.list /etc/apt/sources.list.bak
2.修改/etc/apt/sources.list文件
vim /etc/apt/sources.list
加入如下内容
deb http://mirrors.cloud.aliyuncs.com/debian stable main contrib non-free
deb http://mirrors.cloud.aliyuncs.com/debian stable-proposed-updates main contrib non-free
deb http://mirrors.cloud.aliyuncs.com/debian stable-updates main contrib non-free
deb-src http://mirrors.cloud.aliyuncs.com/debian stable main contrib non-free
deb-src http://mirrors.cloud.aliyuncs.com/debian stable-proposed-updates main contrib non-free
deb-src http://mirrors.cloud.aliyuncs.com/debian stable-updates main contrib non-free
deb http://mirrors.aliyun.com/debian stable main contrib non-free
deb http://mirrors.aliyun.com/debian stable-proposed-updates main contrib non-free
deb http://mirrors.aliyun.com/debian stable-updates main contrib non-free
deb-src http://mirrors.aliyun.com/debian stable main contrib non-free
deb-src http://mirrors.aliyun.com/debian stable-proposed-updates main contrib non-free
deb-src http://mirrors.aliyun.com/debian stable-updates main contrib non-free
保存后执行 apt-get update
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