[Bug 1869870] Re: dist upgrade from 16 to 18 stops

[Ubuntu Foundations Team Bug Bot]

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

** Tags added: xenial2bionic

** 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/1869870

Title:
  dist upgrade from 16 to 18 stops

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

Bug description:
  Unable to upgrade dist due to error posted. tried purging all the
  mentioned ppa which were not from Ubuntu and still not able to upgrade

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.29
  ProcVersionSignature: Ubuntu 4.15.0-91.92~16.04.1-generic 4.15.18
  Uname: Linux 4.15.0-91-generic x86_64
  NonfreeKernelModules: nvidia_uvm wl nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.1-0ubuntu2.22
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Tue Mar 31 16:59:01 2020
  InstallationDate: Installed on 2017-08-27 (946 days ago)
  InstallationMedia: Ubuntu 14.04.5 LTS "Trusty Tahr" - Release amd64 (20160803)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2020-03-31 (0 days ago)
  VarLogDistupgradeTermlog:

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