[Bug 1787576] Re: upgrade to 18.04.1 failed with the error 'could not calculate the upgrade'

[SHAHBAZ KHAN]

** Summary changed:

- upgrade to 18.04.1 failed with the error upgdraded can not be calculated
+ upgrade to 18.04.1 failed with the error 'could not calculate the upgrade'

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

Title:
  upgrade to 18.04.1 failed with the error 'could not calculate the
  upgrade'

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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