[Bug 1793938] Re: could not upgrade from 16.04 to 18.04

[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/1793938

Title:
  could not  upgrade from 16.04 to 18.04

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

Bug description:
  Checking for a new Ubuntu release
  Get:1 Upgrade tool signature [819 B]                                           
  Get:2 Upgrade tool [1,258 kB]                                                  
  Fetched 1,259 kB in 0s (0 B/s)                                                 
  authenticate 'bionic.tar.gz' against 'bionic.tar.gz.gpg' 
  extracting 'bionic.tar.gz'

  Reading cache

  Checking package manager
  Reading package lists... Done
  Building dependency tree        
  Reading state information... Done
  Hit http://us.archive.ubuntu.com/ubuntu xenial InRelease                       
  Hit http://archive.canonical.com/ubuntu xenial InRelease                       
  Get:1 http://us.archive.ubuntu.com/ubuntu xenial-updates InRelease [109 kB]    
  Ign http://dl.google.com/linux/chrome/deb stable InRelease                     
  Hit http://packages.ros.org/ros/ubuntu xenial InRelease                        
  Get:2 http://security.ubuntu.com/ubuntu xenial-security InRelease [107 kB]     
  Get:3 http://us.archive.ubuntu.com/ubuntu xenial-backports InRelease [107 kB]  
  Hit http://dl.google.com/linux/chrome/deb stable Release                       
  Fetched 323 kB in 0s (0 B/s)                                                   
  Reading package lists... Done    
  Building dependency tree          
  Reading state information... Done

  Updating repository information

  Third party sources disabled

  Some third party entries in your sources.list were disabled. You can 
  re-enable them after the upgrade with the 'software-properties' tool 
  or your package manager. 

  To continue please press [ENTER]

  Hit http://us.archive.ubuntu.com/ubuntu bionic InRelease                                                                                                                                                   
  Get:1 http://us.archive.ubuntu.com/ubuntu bionic-updates InRelease [88.7 kB]                                                                                                                               
  Hit http://archive.canonical.com/ubuntu bionic InRelease                                                                                                                                                   
  Get:2 http://security.ubuntu.com/ubuntu bionic-security InRelease [83.2 kB]                                                                                                                                
  Get:3 http://us.archive.ubuntu.com/ubuntu bionic-backports InRelease [74.6 kB]                                                                                                                             
  Fetched 247 kB in 0s (0 B/s)                                                                                                                                                                               

  Checking package manager
  Reading package lists... Done    
  Building dependency tree          
  Reading state information... Done

  Calculating the changes

  Calculating the changes

  Could not calculate the upgrade

  An unresolvable problem occurred while calculating the upgrade.

  This can be caused by: 
  * Upgrading to a pre-release version of Ubuntu 
  * Running the current pre-release version of Ubuntu 
  * Unofficial software packages not provided by Ubuntu 

  If none of this applies, then please report this bug using the 
  command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. 

  
  Restoring original system state

  Aborting

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.25
  ProcVersionSignature: Ubuntu 4.4.0-135.161-generic 4.4.140
  Uname: Linux 4.4.0-135-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Sun Sep 23 05:06:59 2018
  InstallationDate: Installed on 2016-06-18 (826 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2018-09-23 (0 days ago)

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