[Bug 1787013] Re: Could not calculate the upgrade An unresolvable problem occurred while calculating the upgrade. from 16.4 to 18.4 update

[leo]

I installed it

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https://bugs.launchpad.net/bugs/1787013

Title:
  Could not calculate the upgrade  An unresolvable problem occurred
  while calculating the upgrade. from 16.4 to 18.4 update

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

Bug description:
  Displays:
  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

  If none of this applies, then please report this bug using the command
  'ubuntu-bug ubuntu-release-upgrader-core' in a terminal.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.25
  ProcVersionSignature: Ubuntu 4.15.0-30.32~16.04.1-generic 4.15.18
  Uname: Linux 4.15.0-30-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Tue Aug 14 14:20:41 2018
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2017-10-23 (295 days ago)
  InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2018-08-14 (0 days ago)
  VarLogDistupgradeTermlog:

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