[Bug 1787576] [NEW] upgrade to 18.04.1 failed with the error upgdraded can not be calculated

[SHAHBAZ KHAN]

Public bug reported:

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 1:16.04.25
ProcVersionSignature: Ubuntu 4.15.0-32.35~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-32-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Fri Aug 17 16:21:55 2018
InstallationDate: Installed on 2018-01-27 (202 days ago)
InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2018-08-17 (0 days ago)

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
     Assignee: SHAHBAZ KHAN (shahbaz99)
         Status: New


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

** Changed in: ubuntu-release-upgrader (Ubuntu)
     Assignee: (unassigned) => SHAHBAZ KHAN (shahbaz99)

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https://bugs.launchpad.net/bugs/1787576

Title:
  upgrade to 18.04.1 failed with the error upgdraded can not be
  calculated

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

Bug description:
  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 1:16.04.25
  ProcVersionSignature: Ubuntu 4.15.0-32.35~16.04.1-generic 4.15.18
  Uname: Linux 4.15.0-32-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Fri Aug 17 16:21:55 2018
  InstallationDate: Installed on 2018-01-27 (202 days ago)
  InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2018-08-17 (0 days ago)

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