Public bug reported:

mike@mike-think:~$ do-release-upgrade -c
Checking for a new Ubuntu release
Failed to connect to https://changelogs.ubuntu.com/meta-release-lts. Check your 
Internet connection or proxy settings
No new release found.


This machine does not need a proxy to get to the internet.

If I go into web browser and open the link I get the page.

host command does find the host:

mike@mike-think:~$ host changelogs.ubuntu.com
changelogs.ubuntu.com has address 91.189.95.15
changelogs.ubuntu.com has IPv6 address 2001:67c:1560:8008::11

dig also find the host

mike@mike-think:~$ dig changelogs.ubuntu.com

; <<>> DiG 9.11.3-1ubuntu1.1-Ubuntu <<>> changelogs.ubuntu.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 41278
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 65494
;; QUESTION SECTION:
;changelogs.ubuntu.com.         IN      A

;; ANSWER SECTION:
changelogs.ubuntu.com.  600     IN      A       91.189.95.15

;; Query time: 46 msec
;; SERVER: 127.0.0.53#53(127.0.0.53)
;; WHEN: Mon Sep 17 01:52:59 EDT 2018
;; MSG SIZE  rcvd: 66

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.25
ProcVersionSignature: Ubuntu 4.15.0-34.37-generic 4.15.18
Uname: Linux 4.15.0-34-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.9-0ubuntu7.3
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: GNOME
Date: Mon Sep 17 01:47:45 2018
InstallationDate: Installed on 2016-07-24 (784 days ago)
InstallationMedia: Ubuntu-GNOME 16.04.1 LTS "Xenial Xerus" - Release amd64 
(20160720)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2018-09-03 (13 days ago)
VarLogDistupgradeTermlog:

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic dist-upgrade

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https://bugs.launchpad.net/bugs/1792860

Title:
  do-release-upgrade error

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