[Bug 1823551] [NEW] unable to upgrade 16.04 -> 18.04

[Michael King]

Public bug reported:

Checking package manager
Reading package lists... Done
Building dependency tree
Reading state information... Done

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.


Restoring original system state

Aborting
      g package lists... 6%
*** Collecting problem information

The collected information can be sent to the developers to improve the
application. This might take a few minutes.
Reading package lists... Done
Building dependency tree
Reading state information... Done
.
=== Command terminated with exit status 1 (Sun Apr  7 17:15:11 2019) ===

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: Sun Apr  7 17:12:07 2019
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 xenial on 2019-04-07 (0 days ago)

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


** Tags: amd64 apport-bug dist-upgrade uec-images xenial

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https://bugs.launchpad.net/bugs/1823551

Title:
  unable to upgrade 16.04 -> 18.04

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

Bug description:
  Checking package manager
  Reading package lists... Done
  Building dependency tree
  Reading state information... Done

  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.

  
  Restoring original system state

  Aborting
        g package lists... 6%
  *** Collecting problem information

  The collected information can be sent to the developers to improve the
  application. This might take a few minutes.
  Reading package lists... Done
  Building dependency tree
  Reading state information... Done
  .
  === Command terminated with exit status 1 (Sun Apr  7 17:15:11 2019) ===

  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: Sun Apr  7 17:12:07 2019
  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 xenial on 2019-04-07 (0 days ago)

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