[Bug 1894623] Re: not able to upgrade linux neither i am able to install google chrome inspite of trying to install it multiple times

[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/1894623

Title:
  not able to upgrade linux neither i am able to install google chrome
  inspite of trying to install it multiple times

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

Bug description:
  Tried upgrading my linux from version 16 to 18 to which it showed the
  below error:

  An unresolvable problem occurred while calculating the upgrade.

   This was likely caused by:
   * Unofficial software packages not provided by Ubuntu
  Please use the tool 'ppa-purge' from the ppa-purge 
  package to remove software from a Launchpad PPA and 
  try the upgrade again.

  i have also tried installing google chrome and honestly everything
  seemed normal while installing and after i complete the installation
  process i would see that google chrome still hasn't been installed.
  When i tried opening the google chrome package again it showed
  'install' bar instead of 'remove' bar. I have tried installing google
  chrome through terminal but to no avail it has helped.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.30
  ProcVersionSignature: Ubuntu 4.4.0-189.219-generic 4.4.232
  Uname: Linux 4.4.0-189-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.24
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Mon Sep  7 15:38:50 2020
  InstallationDate: Installed on 2019-11-16 (295 days ago)
  InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2020-09-07 (0 days ago)
  VarLogDistupgradeTermlog:

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