You have been subscribed to a public bug:
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)
** Affects: apt (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug dist-upgrade wily2xenial xenial
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Unable to connect to two of the Singapore mirrors
https://bugs.launchpad.net/bugs/1646872
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