Your mirror is included though:
[...]
#LOC:CN
http://ftp.sjtu.edu.cn/ubuntu/
http://mirror.neu.edu.cn/ubuntu/
http://mirrors.aliyun.com/ubuntu/
http://mirrors.cqu.edu.cn/ubuntu/
[...]
Maybe someone else is shipping another list of mirrors?
** Package changed: python-apt (Ubuntu) => ubuntu
** Changed in: ubuntu
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1583544
Title:
an official mirror doesn't show in mirrors list in Update Center,
Ubuntu 16.04
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