[Bug 1801565] [NEW] system did not upgrade to 18.04 to 16.04, saying no updates available

[Nishka]

Public bug reported:

when the command to check for new upgrades was executed it, it said that
a problem occured while calculating upgrade and the upgrade couldn't be
made.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.25
ProcVersionSignature: Ubuntu 4.4.0-137.163-generic 4.4.144
Uname: Linux 4.4.0-137-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Sun Nov  4 10:43:33 2018
DistributionChannelDescriptor:
 # This is a distribution channel descriptor
 # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
 canonical-oem-somerville-xenial-amd64-20160624-2
InstallationDate: Installed on 2017-05-29 (523 days ago)
InstallationMedia: Ubuntu 16.04 "Xenial" - Build amd64 LIVE Binary 20160624-10:47
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2018-11-04 (0 days ago)
mtime.conffile..etc.update-manager.release-upgrades: 2018-11-04T10:22:37.814033

** 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/1801565

Title:
  system did not upgrade to 18.04 to 16.04, saying no updates available

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

Bug description:
  when the command to check for new upgrades was executed it, it said
  that  a problem occured while calculating upgrade and the upgrade
  couldn't be made.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.25
  ProcVersionSignature: Ubuntu 4.4.0-137.163-generic 4.4.144
  Uname: Linux 4.4.0-137-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Sun Nov  4 10:43:33 2018
  DistributionChannelDescriptor:
   # This is a distribution channel descriptor
   # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
   canonical-oem-somerville-xenial-amd64-20160624-2
  InstallationDate: Installed on 2017-05-29 (523 days ago)
  InstallationMedia: Ubuntu 16.04 "Xenial" - Build amd64 LIVE Binary 20160624-10:47
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2018-11-04 (0 days ago)
  mtime.conffile..etc.update-manager.release-upgrades: 2018-11-04T10:22:37.814033

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