[Bug 1789550] [NEW] It does not perform progress at release 18.04

[lorenpro]

Public bug reported:

It does not perform progress at release 18.04LTS from 16.04LTS
Unsolvable problem during progress. Reasons: - Advancement to a pre-
release version of Ubuntu, - Execution of 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 4.4.0-134.160-generic 4.4.140
Uname: Linux 4.4.0-134-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Wed Aug 29 07:41:48 2018
InstallationDate: Installed on 2016-08-11 (747 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2018-08-29 (0 days ago)
VarLogDistupgradeTermlog:

** 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/1789550

Title:
  It does not perform progress at release 18.04

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

Bug description:
  It does not perform progress at release 18.04LTS from 16.04LTS
  Unsolvable problem during progress. Reasons: - Advancement to a pre-
  release version of Ubuntu, - Execution of 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 4.4.0-134.160-generic 4.4.140
  Uname: Linux 4.4.0-134-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Wed Aug 29 07:41:48 2018
  InstallationDate: Installed on 2016-08-11 (747 days ago)
  InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2018-08-29 (0 days ago)
  VarLogDistupgradeTermlog:

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