[Bug 1889125] [NEW] unable to upgrade from16.04 to 18.04

[Ho Tun Tang]

Public bug reported:

 unknown error, after clear all lanchpad link and disable 3rd party link
update

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.30
ProcVersionSignature: Ubuntu 4.15.0-112.113~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-112-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.23
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Tue Jul 28 04:35:23 2020
InstallationDate: Installed on 2019-12-28 (212 days ago)
InstallationMedia: Ubuntu 16.04.6 LTS "Xenial Xerus" - Release amd64 (20190227)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2020-07-27 (0 days ago)

** 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/1889125

Title:
  unable to upgrade from16.04 to 18.04

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

Bug description:
   unknown error, after clear all lanchpad link and disable 3rd party
  link update

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.30
  ProcVersionSignature: Ubuntu 4.15.0-112.113~16.04.1-generic 4.15.18
  Uname: Linux 4.15.0-112-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.1-0ubuntu2.23
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Tue Jul 28 04:35:23 2020
  InstallationDate: Installed on 2019-12-28 (212 days ago)
  InstallationMedia: Ubuntu 16.04.6 LTS "Xenial Xerus" - Release amd64 (20190227)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2020-07-27 (0 days ago)

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