[Bug 1857635] Re: Unresolvable Error when updating to 18.04, no cause given

[Ubuntu Foundations Team Bug Bot]

** Tags added: xenial2bionic

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https://bugs.launchpad.net/bugs/1857635

Title:
  Unresolvable Error when updating to 18.04, no cause given

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

Bug description:
  Trying to upgrade from 16.04 to 18.04, disabled all but "canonical
  partners" in the Other Software Tab of "Software and Updates" after
  getting a previous error message with likely cause given.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.29
  ProcVersionSignature: Ubuntu 4.4.0-170.199-generic 4.4.200
  Uname: Linux 4.4.0-170-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.21
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Thu Dec 26 19:00:59 2019
  InstallationDate: Installed on 2017-08-09 (868 days ago)
  InstallationMedia: Ubuntu 14.04.4 LTS "Trusty Tahr" - Release amd64 (20160217.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2019-12-26 (0 days ago)
  VarLogDistupgradeTermlog:

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