[Bug 1890112] [NEW] Unable to upgrade ubuntu 16.04 to 18.04

[Leandro Candau]

Public bug reported:

While upgrading ubuntu 16.04 to 18.04 the process fails yielding the
message:

No se ha podido calcular la actualización

An unresolvable problem occurred while calculating the upgrade.

 Si nada de esto aplica, informe de este error usando la orden «ubuntu-
bug ubuntu-release-upgrader-core» en una terminal.If you want to
investigate this yourself the log files in '/var/log/dist-upgrade' will
contain details about the upgrade. Specifically, look at 'main.log' and
'apt.log'

Before that it also complained about the ppa in the system, so as
suggested I removed them.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.30
ProcVersionSignature: Ubuntu 4.15.0-112.113~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-112-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.23
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Mon Aug  3 09:28:38 2020
InstallationDate: Installed on 2019-01-22 (558 days ago)
InstallationMedia: Ubuntu 16.04.4 LTS "Xenial Xerus" - Release amd64 (20180228)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2020-08-03 (0 days ago)
VarLogDistupgradeTermlog:
 
mtime.conffile..etc.update-manager.release-upgrades: 2020-08-03T09:22:59.996866

** 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/1890112

Title:
  Unable to upgrade ubuntu 16.04 to 18.04

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

Bug description:
  While upgrading ubuntu 16.04 to 18.04 the process fails yielding the
  message:

  No se ha podido calcular la actualización

  An unresolvable problem occurred while calculating the upgrade.

   Si nada de esto aplica, informe de este error usando la orden
  «ubuntu-bug ubuntu-release-upgrader-core» en una terminal.If you want
  to investigate this yourself the log files in '/var/log/dist-upgrade'
  will contain details about the upgrade. Specifically, look at
  'main.log' and 'apt.log'

  Before that it also complained about the ppa in the system, so as
  suggested I removed them.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.30
  ProcVersionSignature: Ubuntu 4.15.0-112.113~16.04.1-generic 4.15.18
  Uname: Linux 4.15.0-112-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.23
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Mon Aug  3 09:28:38 2020
  InstallationDate: Installed on 2019-01-22 (558 days ago)
  InstallationMedia: Ubuntu 16.04.4 LTS "Xenial Xerus" - Release amd64 (20180228)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2020-08-03 (0 days ago)
  VarLogDistupgradeTermlog:
   
  mtime.conffile..etc.update-manager.release-upgrades: 2020-08-03T09:22:59.996866

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