[Bug 1787990] [NEW] Failed upgrade from 16.04 to 18.04: could not calculate upgrade

[Stefano Bellotti]

Public bug reported:

-Source package: ubuntu-release-upgrader-core

1) lsb_release -rd:
Description:	Ubuntu 16.04.5 LTS
Release:	16.04

2) apt-cache policy ubuntu-release-upgrader-core:
ubuntu-release-upgrader-core:
  Installato: 1:16.04.25
  Candidato:  1:16.04.25
  Tabella versione:
 *** 1:16.04.25 500
        500 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
        500 http://archive.ubuntu.com/ubuntu xenial-updates/main i386 Packages
        500 http://archive.ubuntu.com/ubuntu xenial-security/main amd64 Packages
        500 http://archive.ubuntu.com/ubuntu xenial-security/main i386 Packages
        100 /var/lib/dpkg/status
     1:16.04.12 500
        500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
        500 http://archive.ubuntu.com/ubuntu xenial/main i386 Packages


3) I expected to upgrade smoothly from Ubuntu 16.04 LTS to 18.04 LTS.

4) Instead, when using 'sudo do-release-upgrade' the process stops,
throwing the error message 'could not calculate upgrade' and suggesting
different causes. Unfortunately, all of them are beyond my understanding
and therefore I don't know which package could cause this problem.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.25
ProcVersionSignature: Ubuntu 4.4.0-133.159-generic 4.4.134
Uname: Linux 4.4.0-133-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Mon Aug 20 18:15:32 2018
InstallationDate: Installed on 2014-06-21 (1520 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2018-08-20 (0 days ago)

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


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

** Attachment added: "main.log"
   https://bugs.launchpad.net/bugs/1787990/+attachment/5178136/+files/main.log

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https://bugs.launchpad.net/bugs/1787990

Title:
  Failed upgrade from 16.04 to 18.04: could not calculate upgrade

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

Bug description:
  -Source package: ubuntu-release-upgrader-core

  1) lsb_release -rd:
  Description:	Ubuntu 16.04.5 LTS
  Release:	16.04

  2) apt-cache policy ubuntu-release-upgrader-core:
  ubuntu-release-upgrader-core:
    Installato: 1:16.04.25
    Candidato:  1:16.04.25
    Tabella versione:
   *** 1:16.04.25 500
          500 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
          500 http://archive.ubuntu.com/ubuntu xenial-updates/main i386 Packages
          500 http://archive.ubuntu.com/ubuntu xenial-security/main amd64 Packages
          500 http://archive.ubuntu.com/ubuntu xenial-security/main i386 Packages
          100 /var/lib/dpkg/status
       1:16.04.12 500
          500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
          500 http://archive.ubuntu.com/ubuntu xenial/main i386 Packages

  
  3) I expected to upgrade smoothly from Ubuntu 16.04 LTS to 18.04 LTS.

  4) Instead, when using 'sudo do-release-upgrade' the process stops,
  throwing the error message 'could not calculate upgrade' and
  suggesting different causes. Unfortunately, all of them are beyond my
  understanding and therefore I don't know which package could cause
  this problem.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.25
  ProcVersionSignature: Ubuntu 4.4.0-133.159-generic 4.4.134
  Uname: Linux 4.4.0-133-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Mon Aug 20 18:15:32 2018
  InstallationDate: Installed on 2014-06-21 (1520 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2018-08-20 (0 days ago)

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