[Bug 1797520] [NEW] Ubuntu upgrade failes despite unchecking all 3rd party software sources

[dsdhule]

Public bug reported:

I tried with all 3rd party software sources disabled. Apt update and apt
upgrade do not fail. But, still not able to continue upgrade.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.25
ProcVersionSignature: Ubuntu 4.4.0-137.163-generic 4.4.144
Uname: Linux 4.4.0-137-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Fri Oct 12 13:10:54 2018
InstallationDate: Installed on 2017-06-12 (486 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2018-10-12 (0 days ago)
mtime.conffile..etc.update-manager.release-upgrades: 2018-10-12T12:50:15.414457

** 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/1797520

Title:
  Ubuntu upgrade failes despite unchecking all 3rd party software
  sources

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

Bug description:
  I tried with all 3rd party software sources disabled. Apt update and
  apt upgrade do not fail. But, still not able to continue upgrade.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.25
  ProcVersionSignature: Ubuntu 4.4.0-137.163-generic 4.4.144
  Uname: Linux 4.4.0-137-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Fri Oct 12 13:10:54 2018
  InstallationDate: Installed on 2017-06-12 (486 days ago)
  InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2018-10-12 (0 days ago)
  mtime.conffile..etc.update-manager.release-upgrades: 2018-10-12T12:50:15.414457

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