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.
** Changed in: launchpad Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1583544 Title: an official mirror doesn't show in mirrors list in Update Center, Ubuntu 16.04 To manage notifications about this bug go to: https://bugs.launchpad.net/launchpad/+bug/1583544/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs