[Bug 1810673] [NEW] Cannot upgrade 16.04 to 18.04

[Manfred Diaz]

*** This bug is a duplicate of bug 1611737 ***
    https://bugs.launchpad.net/bugs/1611737

Public bug reported:

1. Release of Ubuntu 
 Ubuntu 16.04.5 LTS
2. apt policy ubuntu-release-upgrader-core
  Installed: 1:16.04.26
  Candidate: 1:18.04.29
  Version table:
     1:18.04.29 500
        500 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
        500 http://archive.ubuntu.com/ubuntu bionic-updates/main i386 Packages
     1:18.04.17 500
        500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages
        500 http://archive.ubuntu.com/ubuntu bionic/main i386 Packages
        500 http://ca.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
        500 http://ca.archive.ubuntu.com/ubuntu bionic/main i386 Packages
 *** 1:16.04.26 100
        100 /var/lib/dpkg/status
3. I expected my system to upgrade to 18.04.
4. The upgrade process failed with the following error:

Calculating the changes

Calculating the changes

Could not calculate the upgrade

An unresolvable problem occurred while calculating the upgrade.

This can be caused by: 
* Upgrading to a pre-release version of Ubuntu 
* Running the current pre-release version of Ubuntu 
* Unofficial software packages not provided by Ubuntu

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.26
ProcVersionSignature: Ubuntu 4.15.0-43.46~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-43-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: GNOME
Date: Sun Jan  6 12:44:57 2019
InstallationDate: Installed on 2017-09-12 (480 days ago)
InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2019-01-06 (0 days ago)

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


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

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https://bugs.launchpad.net/bugs/1810673

Title:
  Cannot upgrade 16.04 to 18.04

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

Bug description:
  1. Release of Ubuntu 
   Ubuntu 16.04.5 LTS
  2. apt policy ubuntu-release-upgrader-core
    Installed: 1:16.04.26
    Candidate: 1:18.04.29
    Version table:
       1:18.04.29 500
          500 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
          500 http://archive.ubuntu.com/ubuntu bionic-updates/main i386 Packages
       1:18.04.17 500
          500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages
          500 http://archive.ubuntu.com/ubuntu bionic/main i386 Packages
          500 http://ca.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
          500 http://ca.archive.ubuntu.com/ubuntu bionic/main i386 Packages
   *** 1:16.04.26 100
          100 /var/lib/dpkg/status
  3. I expected my system to upgrade to 18.04.
  4. The upgrade process failed with the following error:

  Calculating the changes

  Calculating the changes

  Could not calculate the upgrade

  An unresolvable problem occurred while calculating the upgrade.

  This can be caused by: 
  * Upgrading to a pre-release version of Ubuntu 
  * Running the current pre-release version of Ubuntu 
  * Unofficial software packages not provided by Ubuntu

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.26
  ProcVersionSignature: Ubuntu 4.15.0-43.46~16.04.1-generic 4.15.18
  Uname: Linux 4.15.0-43-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: GNOME
  Date: Sun Jan  6 12:44:57 2019
  InstallationDate: Installed on 2017-09-12 (480 days ago)
  InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2019-01-06 (0 days ago)

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