an official mirror doesn't show in mirrors list in Update Center, Ubuntu 16.04

[夏鼎]

There is an official mirror mirrors.cug.edu.cn and I have seen it
listed in https://launchpad.net/ubuntu/+mirror/mirrors.cug.edu.cn-archive, but I can't find it in Update Center in Ubuntu 16.04, Chinese mirrors list.

It seems that the package python-apt ships a template file for the list
of mirrors, and then it doesnt get updated over time.
There is a function called get_ubuntu_lp_mirrors but it doesnt seem to
be used.

[Julian Andres Klode (juliank)]

It's automatically run during an (upstream) build from the git repository, which was on Jan 20. The mirror list is usually not updated anymore then once it hits a stable Ubuntu release.

A better approach would be to ship a mirror list in the archive that APT can fetch during an apt update.

[Julian Andres Klode (juliank)]

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?

[Julian Andres Klode (juliank)]

Oops, sorry, cqu is not the same as cug.

[Julian Andres Klode (juliank)]

The mirror is not listed in https://launchpad.net/ubuntu/+archivemirrors-rss and thus is not added to python-apt.

[Julian Andres Klode (juliank)]

Probably because

"We have found no versions for any architectures on this mirror. This is normal if we have not yet successfully verified the mirror."

[Julian Andres Klode (juliank)]

Marking this as incomplete for now. The mirror probably needs to be accessible from Launchpad, but it refuses any connection attempt.

[Colin Watson (cjwatson)]

Yes, Launchpad can't probe this mirror as it seems to either refuse connections or time out. (The mirror admin should have been notified about this by email.) I'm afraid that we can only list mirrors that we can automatically verify as being reasonably up to date, so the mirror needs to be configured to allow us to do so.

[Launchpad Janitor (janitor)]

[Expired for python-apt (Ubuntu) because there has been no activity for 60 days.]