[Bug 1914846] Re: cannot upgrade from 16.04 to 18.04

[Humphrey van Polanen Petel]

I had Software & Updates set to use the Australian server.

I switched to the main server and the update proceeded without problems.


IMHO this is NOT a matter for the support sites, but for whomever it
concerns (at Canonical, I presume) to get the people maintaining the
Australian server to do what they need to do.

Providing a mirror is very commendable, but brings with the OBLIGATION
to keep it up-to-date and no excuses accepted.

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https://bugs.launchpad.net/bugs/1914846

Title:
  cannot upgrade from 16.04 to 18.04

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  Software Updater offered upgrading to 18.04.5 (I have 16.04.7)

  clicking <upgrade> resulted in this warning (all on one line)

  W:The repository 'http://au.archive.ubuntu.com/ubuntu bionic-backports Release' does not have a Release file., 
  W:Data from such a repository can't be authenticated and is therefore potentially dangerous to use., 
  W:See apt-secure(8) manpage for repository creation and user configuration details., 
  E:Failed to fetch http://au.archive.ubuntu.com/ubuntu/dists/bionic-backports/main/binary-i386/Packages  403  Forbidden [IP: 202.158.214.106 80], 
  E:Failed to fetch http://au.archive.ubuntu.com/ubuntu/dists/bionic-updates/main/dep11/icons-64x64.tar  403  Forbidden [IP: 202.158.214.106 80], 
  E:Failed to fetch http://au.archive.ubuntu.com/ubuntu/dists/bionic/universe/dep11/icons-64x64.tar  403  Forbidden [IP: 202.158.214.106 80], 
  E:Some index files failed to download. They have been ignored, or old ones used instead.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.32
  ProcVersionSignature: Ubuntu 4.15.0-133.137~16.04.1-generic 4.15.18
  Uname: Linux 4.15.0-133-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.20.1-0ubuntu2.30
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Sat Feb  6 16:52:09 2021
  InstallationDate: Installed on 2018-11-23 (806 days ago)
  InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: release-upgrade
  UpgradeStatus: Upgraded to xenial on 2021-02-06 (0 days ago)
  VarLogDistupgradeAptlog:
   Log time: 2021-02-06 16:38:40.673705
   Log time: 2021-02-06 16:38:47.665694
   Log time: 2021-02-06 16:42:39.710816
  VarLogDistupgradeTermlog:

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