[Bug 1824748] Re: Failure to upgrade from 16.04.6 LTS to 18.04, due to failing to calculate changes

[Ubuntu Foundations Team Bug Bot]

** Tags added: xenial2bionic

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https://bugs.launchpad.net/bugs/1824748

Title:
  Failure to upgrade from 16.04.6 LTS to 18.04, due to failing to
  calculate changes

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

Bug description:
  lsb_release -rd

  Description:	Ubuntu 16.04.6 LTS
  Release:	16.04

  
  In /var/log/dist-upgrade/main.log, there is this error message:

  2019-04-14 22:29:40,878 ERROR Dist-upgrade failed: 'E:Error,
  pkgProblemResolver::Resolve generated breaks, this may be caused by
  held packages.'

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.26
  ProcVersionSignature: Ubuntu 4.4.0-143.169-generic 4.4.170
  Uname: Linux 4.4.0-143-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: i3
  Date: Sun Apr 14 22:31:09 2019
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2019-04-15 (0 days ago)
  VarLogDistupgradeAptclonesystemstate.tar.gz:
   Error: command ['pkexec', 'cat', '/var/log/dist-upgrade/apt-clone_system_state.tar.gz'] failed with exit code 127: polkit-agent-helper-1: error response to PolicyKit daemon: GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed: No session for cookie
   Error executing command as another user: Not authorized
   
   This incident has been reported.

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