[Bug 1796697] Re: Could not calculate upgrade ubuntu 16.04 to 18.04

[Brian Murray]

Thank you for taking the time to report this bug and helping to make
Ubuntu better. The error that you are a reporting is a conflict between
packages from the official Ubuntu archive and packages from a PPA. To
resolve this situation please deactivate PPAs using the tool 'ppa-purge'
which is provided by the ppa-purge package. Then try performing the
release upgrade again. Thanks in advance!

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Invalid

** Tags added: ppa-conflict

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https://bugs.launchpad.net/bugs/1796697

Title:
  Could not calculate upgrade ubuntu 16.04 to 18.04

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

Bug description:
  Version Using: Ubuntu 16.04.5 LTS

  I am trying to update my ubuntu 16.04 to 18.04 but unable to do so.
  Tried a lot of things but failed miserably. Here is my log when I try
  to update via terminal

  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://repo.steampowered.com/steam precise InRelease                       
  Hit http://ppa.launchpad.net/git-core/ppa/ubuntu xenial InRelease              
  Hit http://linux.teamviewer.com/deb stable InRelease                           
  Hit http://linux.teamviewer.com/deb preview InRelease                          
  Ign http://dl.google.com/linux/chrome/deb stable InRelease                     
  Hit http://ppa.launchpad.net/jonathonf/vim/ubuntu xenial InRelease             
  Hit http://dl.google.com/linux/chrome/deb stable Release                       
  Hit http://us.archive.ubuntu.com/ubuntu xenial InRelease                       
  Get:1 http://security.ubuntu.com/ubuntu xenial-security InRelease [107 kB]     
  Hit http://ppa.launchpad.net/ondrej/php/ubuntu xenial InRelease                
  Hit https://repo.skype.com/deb stable InRelease                                
  Hit https://download.docker.com/linux/ubuntu xenial InRelease                  
  Hit http://ppa.launchpad.net/webupd8team/java/ubuntu xenial InRelease          
  Get:2 http://us.archive.ubuntu.com/ubuntu xenial-updates InRelease [109 kB]    
  Hit https://download.sublimetext.com apt/stable/ InRelease                     
  Get:3 http://us.archive.ubuntu.com/ubuntu xenial-backports InRelease [107 kB]  
  Hit https://packagecloud.io/slacktechnologies/slack/debian jessie InRelease    
  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                       
  Hit http://security.ubuntu.com/ubuntu bionic-security InRelease                
  Hit http://us.archive.ubuntu.com/ubuntu bionic-updates InRelease               
  Hit http://us.archive.ubuntu.com/ubuntu bionic-backports InRelease             
  Fetched 0 B 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
  Reading package lists... Done    
  Building dependency tree          
  Reading state information... Done

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.25
  ProcVersionSignature: Ubuntu 4.15.0-36.39~16.04.1-generic 4.15.18
  Uname: Linux 4.15.0-36-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CrashDB: ubuntu
  Date: Mon Oct  8 17:11:35 2018
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2017-08-31 (403 days ago)
  InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2018-10-08 (0 days ago)

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