[Bug 1799855] Re: distribution upgrade bug - upgrading to 18.10

[Brian Murray]

@Chris - I'm not certain this is an adequate test of the upgrade process
given that you manually modified /etc/apt/sources.list and then ran do-
release-upgrade. If you want to confirm that this bug is fixed please
skip modifying your sources.list file and just run 'do-release-upgrade
-p'.  Thanks!

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https://bugs.launchpad.net/bugs/1799855

Title:
  distribution upgrade bug - upgrading to 18.10

Status in ubuntu-release-upgrader package in Ubuntu:
  Fix Released
Status in ubuntu-release-upgrader source package in Cosmic:
  Fix Committed

Bug description:
  [Impact]

  Without this, upgrades from Lubuntu 18.04 to 18.10 don't work properly
  and display an error as shown below.

  [Test Case]

  Using a Lubuntu 18.04 system, ensuring that "Prompt=normal" is set in
  /etc/update-manager/release-upgrades, run `do-release-upgrade -p`.

  [Regression Potential]

  Little to none. This could only regress if lubuntu-core was re-
  introduced into Cosmic, which is very unlikely at this point in time.

  [Original Description]

  Can't install 'lubuntu-core'

  It was impossible to install a required package. Please report this as
  a bug using 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.27
  ProcVersionSignature: Ubuntu 4.15.0-38.41-generic 4.15.18
  Uname: Linux 4.15.0-38-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.4
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: LXDE
  Date: Wed Oct 24 21:58:18 2018
  InstallationDate: Installed on 2018-06-17 (129 days ago)
  InstallationMedia: Lubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2018-10-25 (0 days ago)
  VarLogDistupgradeTermlog:

  mtime.conffile..etc.update-manager.release-upgrades:
  2018-06-17T14:56:38.161228

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