APT will switch to the next server in the list after 2 minutes (before 18.04). Starting with 18.04, it will switch in about 150ms.
** Changed in: apt (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to apt in Ubuntu. https://bugs.launchpad.net/bugs/1646872 Title: Unable to connect to two of the Singapore mirrors Status in apt package in Ubuntu: Invalid Bug description: Two of the Singapore mirrors are not up, causing apt-get to halt for at least a minute before timing out. Here are the IP-addresses for the Singapore mirrors: $ host sg.archive.ubuntu.com sg.archive.ubuntu.com has address 91.189.88.149 sg.archive.ubuntu.com has address 91.189.88.162 sg.archive.ubuntu.com has address 91.189.88.152 sg.archive.ubuntu.com has address 91.189.88.161 sg.archive.ubuntu.com has IPv6 address 2001:67c:1560:8001::11 sg.archive.ubuntu.com has IPv6 address 2001:67c:1360:8001::17 sg.archive.ubuntu.com has IPv6 address 2001:67c:1560:8001::14 sg.archive.ubuntu.com has IPv6 address 2001:67c:1360:8001::21 Out of these, the following two addresses are unavailable and when attempting to connect to them, apt-get will hang: 2001:67c:1560:8001::14 2001:67c:1560:8001::17 All of the IPv4 addresses as well as the remaining IPv6 addresses works fine. If these servers are never coming back online, I'd suggest removing those two IP addresses from the DNS entry for the host sg.archive.ubuntu.com ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: ubuntu-release-upgrader-core 1:16.04.18 ProcVersionSignature: Ubuntu 4.4.0-47.68-generic 4.4.24 Uname: Linux 4.4.0-47-generic x86_64 NonfreeKernelModules: nvidia_uvm nvidia ApportVersion: 2.20.1-0ubuntu2.1 Architecture: amd64 CrashDB: ubuntu CurrentDesktop: GNOME-Flashback:Unity Date: Fri Dec 2 23:36:54 2016 InstallationDate: Installed on 2014-12-11 (722 days ago) InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1) PackageArchitecture: all SourcePackage: ubuntu-release-upgrader Symptom: dist-upgrade UpgradeStatus: Upgraded to xenial on 2016-04-29 (216 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1646872/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp