[Bug 1786826] [NEW] Trying to upgrade from Ubuntu Gnome 16.4 to Ubuntu 18.4 but reports "could not calculate the upgrade"

[Martinichka]

Public bug reported:

Description:	Ubuntu 16.04.5 LTS
Release:	16.04

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: GNOME
Date: Mon Aug 13 19:33:39 2018
InstallationDate: Installed on 2018-01-06 (219 days ago)
InstallationMedia: Ubuntu-GNOME 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2018-08-13 (0 days ago)
VarLogDistupgradeTermlog:

** 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/1786826

Title:
  Trying to upgrade from Ubuntu Gnome 16.4 to Ubuntu 18.4 but reports
  "could not calculate the upgrade"

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

Bug description:
  Description:	Ubuntu 16.04.5 LTS
  Release:	16.04

  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: GNOME
  Date: Mon Aug 13 19:33:39 2018
  InstallationDate: Installed on 2018-01-06 (219 days ago)
  InstallationMedia: Ubuntu-GNOME 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2018-08-13 (0 days ago)
  VarLogDistupgradeTermlog:

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