[Bug 1813692] [NEW] Upgrade from 16.04 to 18.04 fails after disabling most third-party packages

[Michael Corey]

Public bug reported:

I have tried disabling any less-common third-party packages, but am getting the 
"Could not calculate the upgrade" on the "Setting new software channels" step.

I boot into Ubuntu via ReFind, if that makes any difference.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.26
ProcVersionSignature: Ubuntu 4.4.0-141.167-generic 4.4.162
Uname: Linux 4.4.0-141-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CrashDB: ubuntu
Date: Mon Jan 28 19:12:21 2019
EcryptfsInUse: Yes
InstallationDate: Installed on 2016-10-10 (840 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_US
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2019-01-29 (0 days ago)
VarLogDistupgradeTermlog:

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


** Tags: amd64 apport-bug dist-upgrade third-party-packages xenial

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https://bugs.launchpad.net/bugs/1813692

Title:
  Upgrade from 16.04 to 18.04 fails after disabling most third-party
  packages

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

Bug description:
  I have tried disabling any less-common third-party packages, but am getting the 
  "Could not calculate the upgrade" on the "Setting new software channels" step.

  I boot into Ubuntu via ReFind, if that makes any difference.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.26
  ProcVersionSignature: Ubuntu 4.4.0-141.167-generic 4.4.162
  Uname: Linux 4.4.0-141-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CrashDB: ubuntu
  Date: Mon Jan 28 19:12:21 2019
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2016-10-10 (840 days ago)
  InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en_US
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2019-01-29 (0 days ago)
  VarLogDistupgradeTermlog:

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