[Bug 1874158] Re: Upgrading Ubuntu to version 18.04 Invalid package information

[Brian Murray]

The mirror of Ubuntu which you are using in an unofficial one and the
release upgrader did not fall back to a generic one in your case. If you
just want to upgrade please switch to an official mirror of the Ubuntu
archive. You can find a list here:

https://launchpad.net/ubuntu/+archivemirrors

** Changed in: ubuntu-release-upgrader (Ubuntu)
   Importance: Undecided => High

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Confirmed

** Summary changed:

- Upgrading Ubuntu to version 18.04  Invalid package information
+ dist-upgrader did not fallback to an official mirror of the archive

** Tags added: rls-bb-incoming

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https://bugs.launchpad.net/bugs/1874158

Title:
  dist-upgrader did not fallback to an official mirror of the archive

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

Bug description:
  Upgrading Ubuntu to version 18.04

  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.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.24
  ProcVersionSignature: Ubuntu 4.4.0-116.140-generic 4.4.98
  Uname: Linux 4.4.0-116-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.15
  Architecture: amd64
  CrashDB: ubuntu
  Date: Wed Apr 22 01:11:24 2020
  InstallationDate: Installed on 2015-08-23 (1703 days ago)
  InstallationMedia: Edubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2020-04-21 (0 days ago)
  VarLogDistupgradeAptlog:
   Log time: 2020-04-22 00:53:02.486717
   Log time: 2020-04-22 01:07:19.738572
   Log time: 2020-04-22 01:09:10.724109
   Log time: 2020-04-22 01:11:30.582041
  VarLogDistupgradeTermlog:

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