[Bug 1842762] Re: cannot upgrade from 16.04 to 18.04

[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/1842762

Title:
  cannot upgrade from 16.04 to 18.04

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

Bug description:
  It said that failure to upgrade maybe a result of unofficial ppa
  sources, but I did ppa-purge to remove all possible ppa. Still don't
  work.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.26
  ProcVersionSignature: Ubuntu 4.15.0-60.67~16.04.1-generic 4.15.18
  Uname: Linux 4.15.0-60-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.19
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Thu Sep  5 00:23:14 2019
  InstallationDate: Installed on 2017-09-26 (708 days ago)
  InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2019-09-04 (0 days ago)
  VarLogDistupgradeTermlog:

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