[Bug 1788606] Re: Upgrade from Ubuntu 16.04 to 18.04 fails

[Brian Murray]

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

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https://bugs.launchpad.net/bugs/1788606

Title:
  Upgrade from Ubuntu 16.04 to 18.04 fails

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

Bug description:
  During an attempt to upgrade from Ubuntu 16.04 LTS to 18.04 LTS, the
  "do-release-upgrade" commands exits due to "an unresolvable problem
  occured while calculating the upgrade".

  Before the upgrade, I successfully executed apt-get update, apt-get
  upgrade and apt-get dist-upgrade without errors or warnings.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.25
  ProcVersionSignature: Ubuntu 4.4.0-112.135-generic 4.4.98
  Uname: Linux 4.4.0-112-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CrashDB: ubuntu
  Date: Thu Aug 23 14:25:28 2018
  InstallationDate: Installed on 2015-06-15 (1164 days ago)
  InstallationMedia: Ubuntu-GNOME 15.04 "Vivid Vervet" - Release amd64 (20150422)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2018-08-23 (0 days ago)

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