[Bug 1874900] Re: Can't Upgrade from 16.04 to 18.04, no details in error message

[Ubuntu Foundations Team Bug Bot]

** Tags added: xenial2bionic

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https://bugs.launchpad.net/bugs/1874900

Title:
  Can't Upgrade from 16.04 to 18.04, no details in error message

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

Bug description:
  I am upgrading from 16.04 to 18.04. I removed all non-ubuntu packages
  because that cause complaints at first.

  Now there is an error, but it doesn't specify why it is failing.

  I only get:
  "
  An unresolvable problem occurred while calculating the upgrade. 

  If none of this applies, then please report this bug using the 
  command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal.If 
  you want to investigate this yourself the log files in 
  '/var/log/dist-upgrade' will contain details about the upgrade. 
  Specifically, look at 'main.log' and 'apt.log'. 
  "

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.29
  ProcVersionSignature: Ubuntu 4.15.0-96.97~16.04.1-generic 4.15.18
  Uname: Linux 4.15.0-96-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.1-0ubuntu2.23
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Fri Apr 24 13:05:15 2020
  InstallationDate: Installed on 2016-09-12 (1320 days ago)
  InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2020-04-24 (0 days ago)

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