[Bug 1785745] Re: an unresolvable problem occurred while the upgrade

[Brian Murray]

*** This bug is a duplicate of bug 1611737 ***
    https://bugs.launchpad.net/bugs/1611737

** This bug has been marked a duplicate of bug 1611737
   Can't upgrade from a release if ros packages are  installed from ROS servers

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https://bugs.launchpad.net/bugs/1785745

Title:
  an  unresolvable problem occurred while the upgrade

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

Bug description:
  this can be due to 
  1.upgrading to a pre-releas version of ubuntu
  2.running the current pre-release version of ubuntu
  3.unofficial software packages not provided by ubuntu

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.25
  ProcVersionSignature: Ubuntu 4.15.0-30.32~16.04.1-generic 4.15.18
  Uname: Linux 4.15.0-30-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Tue Aug  7 10:39:15 2018
  InstallationDate: Installed on 2018-01-10 (209 days ago)
  InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2018-08-07 (0 days ago)
  VarLogDistupgradeTermlog:
   
  mtime.conffile..etc.update-manager.release-upgrades: 2018-08-05T10:31:14.390706

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