[Bug 1825978] Re: Xubuntu 16.04.6 upgrading to 18.04.2 error: essential package 'ubuntu-minimal' could not be located

[Ubuntu Foundations Team Bug Bot]

** Tags added: xenial2bionic

** Tags added: third-party-packages

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https://bugs.launchpad.net/bugs/1825978

Title:
  Xubuntu 16.04.6 upgrading to 18.04.2 error: essential package 'ubuntu-
  minimal' could not be located

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

Bug description:
  Xubuntu 16.04.6
  ubuntu-release-upgrader-core 1:16.04.26
  Expected: upgrade to 18.04.2
  What happened: error: "Invalid package information

  After updating your package information, the essential package 'ubuntu-minimal' could not be located. This may be because you have no official mirrors listed in your software sources, or because of excessive load on the mirror you are using. See /etc/apt/sources.list for the current list of configured software sources.
  In the case of an overloaded mirror, you may want to try the upgrade again later."

  After upgrading from 14.04 to 16.04.6, my wifi stopped working. I took
  my PC to work to connect to the internet via network cable, and it was
  successful in doing several security and other updates, including
  linux-image-4.4.0-145-generic. After that, "Software Updater" offered
  to upgrade me to 18.04.2, but kept giving the quoted error above.

  Under "Settings..." ("Software & Updates"), "Ubuntu Software",
  "Download from:" I changed it to "Main server", but got the same
  error. Going back to "Server for South Africa" gave the same error,
  including when picking all 3 listed South African servers. Most
  recently I tried the Swedish server "http://ftp.acc.umu.se/ubuntu",
  but still get the same error.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.26
  ProcVersionSignature: Ubuntu 4.4.0-145.171-generic 4.4.176
  Uname: Linux 4.4.0-145-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CrashDB: ubuntu
  Date: Tue Apr 23 12:56:52 2019
  InstallationDate: Installed on 2014-06-03 (1784 days ago)
  InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en_ZA:en
   LC_TIME=en_za.UTF-8
   PATH=(custom, no user)
   LANG=en_ZA.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2019-04-23 (0 days ago)
  VarLogDistupgradeAptlog:
   Log time: 2019-04-23 12:56:25.628450
   Log time: 2019-04-23 12:56:27.084296
   Log time: 2019-04-23 12:56:43.892373
   Log time: 2019-04-23 12:56:54.211214
  VarLogDistupgradeTermlog:

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